Demi Lovato posted this photo to her Instagram account, Oct. 3, 2016, with the caption "Freckles."

Gwen Stefani posted this image to her Instagram account on May 13, 2016.

Cindy Crawford posted this photo of herself without makeup to her Instagram account on April 9, 2016 with the caption, "Apres workout and sauna."

Demi Lovato posted this image of herself to her Instagram account, Jan. 18, 2016, with the message: "Happy /Entertainment/photos/photos-celebrities-makeup-4577149/NMM my beauties."

Kaley Cuoco is spotted leaving a hair salon in Studio City, Calif. on Jan. 14, 2016.

Courteney Cox visits a mystery man in Los Angeles, Jan. 11, 2016.

Marcia Cross stops to send some packages at the Post Office in Brentwood, California on Dec. 24, 2015.

Kate Hudson is spotted at JFK Airport, Dec. 18, 2015, in New York City.

Lindsay Lohan posted this photo to Instagram on Dec. 13, 2015 with the caption, "Sauna. Rejuvenate. Rehydrate. Repeat."

Katie Holmes picked up a the new VR View-Master at Target in Los Angeles just in time for the Holidays, Nov.16, 2015.

Jennifer Garner is seen on Nov. 10, 2015 in Los Angeles.

Leah Remini posted a video to Instagram on Nov. 3, 2015 with the original caption, "My cute girl @jlo making us dinner."

Christie Brinkley posted this image to Instagram of her getting ready to appear on HSN.

Jennifer Garner is seen on Oct. 25, 2015 in Los Angeles.

Keira Knightley and her husband James Righton seen out and about in New York City on Oct. 7, 2015.

Gwyneth Paltrow with wet hair and no makeup arriving at a studio in Culver City, Calif., Sept 24, 2015.

Claire Danes breaks a sweat to keep her fit physique while jogging around Brentwood, CA, Sept. 23, 2015.

Jennifer Garner walks her daughters to school on Sept. 15, 2015 in Brentwood, Calif.

Halle Berry goes make-up free during a day at Disneyland with her children, Aug. 26, 2015, in Los Angeles.

Sally Field is spotted leaving the Whole Foods in Brentwood, Calif. on Aug. 18, 2015.

American pop star Zendaya lets her fans take her on a tour of central London, Aug. 9, 2015.

Christie Brinkley posted this photo on Instagram, July 22, 2015.

Jennifer Garner is seen while out shopping for children's clothes in Santa Monica, California on June 8, 2015.

Jennifer Garner runs errands on May 28, 2015 in Santa Monica, Calif.

This image was posted to Laverne Cox's Instagram account on May 27, 2015 with the text, "Finally a few days to relax. I feel so privileged to be able to do work that I love and very privileged to be able to take time off occasionally. I take none of it lightly. Always good to have days with no makeup to let my skin breath. /Entertainment/photos/photos-celebrities-makeup-4577149/washfacenobase /Entertainment/photos/photos-celebrities-makeup-4577149/TransIsBeautiful."

Melanie Griffith at gym for her daily routine, May 14, 2015.

Cindy Crawford enjoying her Sunday afternoon, in an image she shared to her Instagram account, May 3, 2015.

Ivanka Trump posted this photo to Instagram, May 1, 2015, with the caption, "I was inspired by @amyschumer's hilarious /Entertainment/photos/photos-celebrities-makeup-4577149/onedirection parody to do my best /Entertainment/photos/photos-celebrities-makeup-4577149/nomakeup /Entertainment/photos/photos-celebrities-makeup-4577149/bluesteel this morning."

Kate Upton is pictured arriving at Heathrow airport on April 28, 2015 in London, England.

Mel B leaves a date with her husband at Matsuhisa in Beverly Hills, Calif., March 16, 2015.

Drew Barrymore posted this photo to Instagram, March 15, 2014, with the caption, "Good morning Tokyo /Entertainment/photos/photos-celebrities-makeup-4577149/japanesebreakfast /Entertainment/photos/photos-celebrities-makeup-4577149/tokyofoodtour"

Emma stone is seen exiting a grocery store in Malibu, Calif., March 11, 2015.

Demi Lovato posted this photo to her Instagram on March 9, 2015.

Drew Barrymore posted this photo on Instagram on Feb. 22, 2015, with the caption "/Entertainment/photos/photos-celebrities-makeup-4577149/forty".

Demi Lovato is seen in a photo posted to her Instagram account on Feb. 10, 2015 with the text, "GOOD MORNING ?? a little late for the /Entertainment/photos/photos-celebrities-makeup-4577149/NMM but, here ya go!!!!"

Jennifer Garner is spotted out having a morning walk in Santa Monica, Calif, Feb. 4, 2015.

Kylie Jenner posted this photo to Instagram, Jan. 11, 2015, with the caption, "you know it's gonna be a good Sunday when ya weaves out & u haven't put ur face on yet."

Jennifer Garner is seen on Dec. 16, 2014 in Los Angeles, Calif.

Jenny McCarthy posted this photo to her Instagram on Dec. 14, 2014.

Model Behati Prinsloo is seen, Dec. 14, 2014 in Los Angeles.

Heidi Klum posted this photo to Instagram on Dec. 10, 2014 with the caption, "Yuck".

Julianne Moore walks in Soho, Dec. 1, 2014, in New York.

Gisele Bundchen covers up as she takes a walk in chilly New York City, Nov. 20, 2014.

Actress Sharon Stone leaves a restaurant in Paris, France on Nov. 18, 2014.

Julie Bowen is pictured jogging in Los Angeles on Nov. 11, 2014.

Lisa Rinna posted this photo to Instagram on Oct. 28, 2014 with the caption, ""I woke up like this" /Entertainment/photos/photos-celebrities-makeup-4577149/UNICEF /Entertainment/photos/photos-celebrities-makeup-4577149/WakeUpCall"

Kelly Osbourne posted this photo to Instagram on Oct. 19, 2014 with the caption, "Someone went a little /Entertainment/photos/photos-celebrities-makeup-4577149/HardCore in the gym today!!! /Entertainment/photos/photos-celebrities-makeup-4577149/FeelingTheBurn."

This image was posted to Jennifer Lopez's Instagram account on Oct. 14, 2014 with the caption, "Now I lay me down to sleep after a great day!! /Entertainment/photos/photos-celebrities-makeup-4577149/inspired but /Entertainment/photos/photos-celebrities-makeup-4577149/mamatired /Entertainment/photos/photos-celebrities-makeup-4577149/sleepwiththeangels /Entertainment/photos/photos-celebrities-makeup-4577149/niteniteLovers."

Katherine Heigl on the set of "State Of Affairs" in Los Angeles, Oct. 13, 2014.

This image was posted to Lady Gaga's Instagram account on Sept. 28, 2014 with the caption, "/Entertainment/photos/photos-celebrities-makeup-4577149/gagadaily Q & A going up now. Post it @emmac_94! /Entertainment/photos/photos-celebrities-makeup-4577149/HausWork."

Katie Holmes is seen shooting a commercial for Oil of Olay in East Village, Sept. 18, 2014, in New York.

This image was posted to Heidi Klum's Instagram account on Sept. 17, 2014 with the caption, "Good morning NYC! Not easy getting out of bed this morning."

Rosie Huntington-Whitely posted this photo to Instagram with the caption, "Beach Day," on Sept. 7, 2014.

Hilary Duff is seen on Aug. 24, 2014 in Los Angeles, Calif.

Elle Fanning heads to dance class in Los Angeles, Aug. 20, 2014.

Model and actress Rosie Huntington-Whiteley is seen out and about in Los Angeles, Calif. on Aug. 19, 2014.

Cindy Crawford walks in Beverly Hills, Calif. on August 13, 2014.

Hilary Duff leaving a gym in Los Angeles, July 30, 2014.

Megan Fox posted this photo on Instagram, July 4, 2014.

Beyonce posted this on Instagram with this caption: "Hello Boston," July 1, 2014.

Marcia Cross is pictured on June 30, 2014 in Los Angeles.

Demi Lovato posted this photo on Twitter on June 17, 2014.

Gwyneth Paltrow, sans wedding ring, is spotted in Manhattan on June 9, 2014.

Emma Watson was spotted out chatting with an elderly man while taking a stroll in North London, UK, June 7, 2014.

Courteney Cox walks outside in Los Angeles, Calif., June 5, 2014.

Lady Gaga posted this photo to her Instagram, June 4, 2014, with the caption, "Day off sleepy girl."

Drew Barrymore posted this photo on May 29, 2014 with the caption, "There's a daisy in my drink ! And @flowerbeauty on my nails /Entertainment/photos/photos-celebrities-makeup-4577149/cheers /Entertainment/photos/photos-celebrities-makeup-4577149/bluehillfarm."

Heidi Klum posted this photo on Instagram with this caption: "Snack Time," May 7 ,2014.

Singer and actress Jordin Sparks stops by a pharmacy after her workout routine, May 4, 2014.

Elsa Pataky posted this photo on Instagram on April 30, 2014.

Paris Photo Director Julien Frydman and actress Gwyneth Paltrow attend Paris Photo Los Angeles at Paramount Studios on April 27, 2014 in Hollywood, Calif.

Kirsten Dunst goes hiking with friends in Los Angeles, Calif., April 19, 2014.

Tyra Banks posted this photo on Instagram with this caption: "Happy Bunny Day," April 20, 2014.

Zoe Saldana posted this photo of herself to Twitter, April 7, 2014.

Alanis Morissette goes make-up free during a lunch outing with husband Mario Treadway in Beverly Hills on March 25, 2014.

Gwyneth Paltrow posted this photo on Instagram on March 22, 2014 with the caption, "full of healing power. /Entertainment/photos/photos-celebrities-makeup-4577149/iLoveWater /Entertainment/photos/photos-celebrities-makeup-4577149/WorldWaterday @drop4drop".

Emma Roberts and fiance Evan Peters at the Hollywood market in California on March 9, 2014.

Gwyneth Paltrow is pictured running errands in Brentwood, Calif. on March 4, 2014.

Emmy Rossum poses for a selfie under a skylight in this photo posted to her Instagram, Feb. 27, 2014.

Leighton Meester posted this photo on Instagram on Feb. 27, 2014 with the caption, "Celebrating John Steinbeck's birthday today w/my @miceandmenbway family. @penguinclassics"

Claire Danes is seen jogging along the Hudson River in New York, Feb. 25, 2014.

Hilary Duff is seen stepping out in Los Angeles, Feb. 18, 2014

Singer Lorde posted this photo to Instagram on Feb. 9, 2014 with the caption, "in bed in paris with my acne cream on".

Reese Witherspoon is pictured on Feb. 11, 2014 in New York City.

Calista Flockhart, left, and Harrison Ford, right, arrive at the Staples Center for a Lakers game on Feb. 9, 2014 in Los Angeles, Calif.

Dakota Fanning arrives at Los Angeles International Airport to catch a flight to New York, Feb. 2, 2014.

Beyonce shared this photo of herself on Instagram, Jan. 29, 2014.

Naomi Watts, wearing no make-up, stops for Starbucks with friends following a workout, Jan. 28, 2014.

Actress Emma Roberts goes makeup-free as she and boyfriend Evan Peters arrive in New Orleans, Jan. 5, 2013.

Kim Kardashian goes makeup free as she exits a nail salon in Beverly Hills, Calif. Jan. 3, 2014.

Patricia Arquette shops at CVS Pharmacy in Malibu, Calif. wearing spandex and no make-up.

Adriana Lima posted this photo to Instagram on Dec. 26, 2013 with the caption, "Getting ready for 2014!! Yeah....!! Let's go baby!"

Miley Cyrus posted this photo to Instagram on Dec. 19, 2013 with the caption, "/Entertainment/photos/photos-celebrities-makeup-4577149/turntupshowertime".

Rachel McAdams makes her way through the terminal at LAX Airport after returning on a flight from her extended tropical getaway on Dec. 18, 2013. The 35-year-old actress dressed comfortably for her flight back to LAX in a grey 'Kale' graphic sweatshirt, black leggings and a pair of flip flops.

Gwyneth Paltrow with her children, Moses and Apple, at John F. Kennedy International Airport in New York.

Jessica Simpson posted this image on Twitter with this caption, "Aquaphor from the diaper bag...And a filter ;) Date night!", Dec. 14, 2013.

Cameron Diaz posted this image to Instagram on Dec. 11, 2013 with the caption, "One of my proudest moments! Receiving the first bound copy of The Body Book!! @thebodybook LADIES!! I wrote this book for YOU and YOUR BODY.. And I'm so excited to share it with you!! You can pre-order it now. /Entertainment/photos/photos-celebrities-makeup-4577149/loveyouramazingbody"

'The Two Faces Of January' actress Kirsten Dunst and her mother Inez out shopping at Bed Bath & Beyond in Studio City, California on December 7, 2013.

Selena Gomez posted this selfie onto Instagram, "I thought he only liked the Latina category. Smh... /Entertainment/photos/photos-celebrities-makeup-4577149/nomakeup /Entertainment/photos/photos-celebrities-makeup-4577149/hatewhengirlssaythat xx"

Brooklyn Decker posted this photo of her on a date with her husband, Andy Roddick, on Twitter on Nov. 27, 2013 with with caption, "Really bringing my A-Game for date night tonight. Eh @andyroddick"

Mila Kunis shops for groceries in Los Angeles, Calif., November 20, 2013.

A fresh-faced Kourtney Kardashian took Mason and Penelope for a Frozen Yogurt treat, Nov. 17, 2013, in Calabasas, Calif.

Kim Kardashian leaves ENail Salon in West Hollywood, Calif., Nov. 14, 2013.

Gisele Bundchen has a makeup free morning as she heads to a photo studio in New York, Nov. 13, 2013.

Alyson Hannigan was spotted purchasing a holiday door-mat reading 'There's no place like Gnome' at Paper Source in Los Angeles, Nov. 12, 2013.

Actress Hilary Duff has her hands full as she makes her way into her acting teacher's home Nov. 6, 2013 for a session.

Jennifer Lawrence bares a make-up free face upon arriving at LAX airport for a flight to New York City, Nov. 04, 2013, in Los Angeles.

A smiley Rihanna posted this photo of herself on Instagram, Oct. 21, 2013.

Mattel's Barbie is quite possibly the most recognized toy on the planet, but there are times when even she's not all dolled up. An image posted on Reddit imagined what Barbie would look like au natural, without her signature blue eye shadow, mascara and bright pink lipstick. The result: she's just like us.

Jessica Biel walks on set for her new film 'Shiva and May' in Los Angeles, Oct. 16, 2013.

Khloe Kardashian films her reality show with Kendall Jenner sweating it out at Tarzana Boxing gym, Oct. 14, 2013.

Calista Flockhart, who is best known for her 'Ally McBeal' role playing a smartly dressed lawyer, looked almost unrecognizable as she stepped out in Santa Monica, Los Angeles.

Model Christy Turlington attends the Every Mother Counts Benefit hosted by Calvin Klein Underwear at Macy's Stella 34 Trattoria on October 7, 2013 in New York City.

Kristin Cavallari leaves Chris McMillian Salon in West Hollywood on Oct. 7, 2013.

Beyonce posted a fresh face on her Instagram account, Sept. 10, 2013.

Andie Macdowell looking amazing at 55 with no makeup on at Los Angeles Airport on September 9, 2013.

Adele sports a new look enroute to a Lady Gaga performance in London, Sept. 1, 2013.

Demi Lovato posted a self-portrait of herself sans makeup on her instagram on Aug. 12, 2013.

Pamela Anderson practices yoga while on vacation in Hawaii, Aug. 11, 2013.

Jennifer Aniston poses with hair stylist Chric McMillan in this photo posted to Instagram on August 3, 2013 with the caption "Best /Entertainment/photos/photos-celebrities-makeup-4577149/friends /Entertainment/photos/photos-celebrities-makeup-4577149/no makeup /Entertainment/photos/photos-celebrities-makeup-4577149/girl-time"

"Machete Kills" actress Jessica Alba arrives at a meeting without makeup in Beverly Hills, Calif. on Aug. 2, 2013.

Gabrielle Union posted this photo to instagram, "Becoming "Erica" ... Before and after... /Entertainment/photos/photos-celebrities-makeup-4577149/UCRM"

Lady Gaga, aka 'Mother Monster' posted this self portrait on her website, littlemonsters.com with caption, "ARTPOP as they pry the single from my bleeding fingers. its a scary thing to revisit those things underneath, the pain in your past. but all I found was raw passion. I thought I was destroyed inside. im just ready to fight. start the music."

Emma Stone walks in the Tribeca neighborhood of New York, June 13, 2013.

Supermodel Tyra Banks feed the parking meter in Chelsea, New York on June 8, 2013.