To most, appearing au natural on the big screen for millions to see sounds like the stuff nightmares are made of. But apparently, not all actors are created equal. Turns out there are those who not only don't have a problem baring it all, they actually enjoy doing these scenes.

Some movies and TV shows have risky scenes in them that are not overly sexual, it just seems normal to show some skin in particular scenes, while other films utilize an actor's willingness to bare down to the point of it becoming adult content. No matter how natural the scenes may be, we imagine preparing for these roles would require months of dieting and sit-ups. Here are 20 stars who don’t mind shedding their clothes in front of others.

20 Amber Heard

Amber Heard is probably most famous for her life with Johnny Depp. However, Heard appeared topless in her big-screen debut Friday Night Lights. Two years later, she appeared topless again in Alpha Dog, then again in The Rum Diary, and The Joneses. In 2009, Heard took the plunge with a full-frontal nudity role for The Informers, and made it clear why Johnny Depp liked her so much!

19 Michael Fassbender

Michael Fassbender really committed to his role in Shame - which included doing a lot of bare scenes. These scenes certainly garnered a lot of attention for the film. Fassbender actually started his career with such a scene as well: in 1998 he appeared as such in an ad for SAS airlines and again in his role in 2008's Hunger.

18 Salma Hayek

You’d never know it by looking at her, but Salma Hayek is 53, and still looks as hot as when she first rose to fame in the 90s. She's a very accomplished actress, never one to shy away from intimidating roles or scenes. She has appeared both partially and fully revealed in several movies, like Desperado, The Velocity of Gary, Frida, and Ask the Dust.

17 Stephen Dorff

Some people may know Stephen Dorff best for starring in a Britney Spears music video, however, Dorff has actually appeared in several films and television shows. Some roles have required him to be au natural, and he's clearly not ashamed to bare all. He did some much-talked-about full-frontal scenes in the 2005 film Shadowboxer, and also showed intimate parts of himself in Innocent Lies, The Motel Life, and Felon.

16 Heather Graham

Graham generally keeps a low profile and isn’t often a tabloid target. In movies, however, she's known to take on explicit roles. She’s been topless in Boogie Woogie, The Hangover, Miss Conception, Adrift in Manhattan, and Broken. She also appeared bottomless in Two Girls and a Guy and At Any Price. And she did full-frontal nudity in both Boogie Nights and Killing Me Softly!

15 Shia Labeouf

These days, Shia LaBeouf is mostly known for his eccentric behavior in real life. LaBeouf shocked everyone when he took on a daring role in the 2013 film Nymphomaniac. In the movie, he took part in graphic scenes, and, of course, some nudity went along with that. Since then, he's also been seen free and in the wind in Charlie Countryman and Sigur Ros' music video for the song Fjögur Píanó.

14 Demi Moore

Another celeb who doesn’t mind getting naked for the big screen and also doesn’t seem to age is actress Demi Moore. Her body of work spans more than 30 years and includes several roles that required nudity, much to her fans’ approval. She first appeared topless on film in 1984 when she acted in Blame It On Rio, and since then she's shown her body in several movies.

13 James Franco

James Franco and Seth Rogen had to survive in the wild in the altogether in an episode of Discovery's "Naked and Afraid" series. Whereas Franco expressed his love for being au natural and the sense of freedom that comes with it, Rogen asked, "Can you make the blur big? Like a giant blur?"

12 Angelina Jolie

She’s likely one of the most uninhibited actresses in Hollywood, given her views on love, relations, and marriage. Angelina has bared herself in films like Original Sin, Wanted, Taking Lives, and Pushing Tin. However, since she became a mother, she has stuck to more wholesome roles, but we’ll never forget how she flaunted her body in her earlier flicks.

11 Alexander Skarsgard

Skarsgard has taken his clothes off in pretty much every movie and TV show he's ever appeared in. The True Blood star also left his clothes behind on a trip to the South Pole, so it's quite clear that we're dealing with an actor who has zero problems with nudity. As he once explained to Rolling Stone: "if we're naked in the scene, then I'm naked."

10 Charlize Theron

If you’ve got a body like Charlize Theron’s, why wouldn’t you want to flaunt it? The South African actress has said in an interview that she has no issues being naked because she’s very confident with her body and comfortable with who she is. She has gone all out in films such as The Burning Plain, Two Days in the Valley, Monster, and The Devil’s Advocate.

9 Kirsten Dunst

She's known for being the woman-child who planted a kiss on Brad Pitt’s lips in Interview With The Vampire, and the famous upside-down Spider-man kiss. But Kirsten Dunst has done more than some memorable kisses on the screen. She's said she’s comfortable going bare if there’s a good reason for it. She has shown some of her intimate parts in the films Melancholia, Crazy Beautiful, and All Good Things.

8 Amanda Seyfried

Fans probably remember Amanda Seyfried’s younger days in her role as Karen, one of the members of queen bee Regina’s posse in the teen flick Mean Girls. She went free in the film Lovelace, in which she portrayed the famed adult film star Linda Lovelace. On nudity, Seyfried said that doing it felt liberating and that she didn’t understand why it’s censored in movies.

7 Diane Lane

Lane has taken on some risque roles without the risk of overexposure, professionally speaking, that is. In terms of physical exposure, Lane has bared it all in films such as Unfaithful, A Walk on the Moon, Knight Moves, and Descending Angel. She explained that all her riskier scenes were part of the context of the story and she was comfortable doing it.

6 Helen Mirren

Helen Mirren is one of the few performers who have achieved the Triple Crown of acting, having impressively won an Academy Award, a Tony Award, and several Emmy Awards. Given her long line of achievements, she hasn’t had any qualms baring it all, appearing naked in several films including Calendar Girls in 2003. Of course, she says those days are behind her.

5 Jennifer Aniston

For her role as Rachel in Friends, she has won an Emmy, a Golden Globe, and a Screen Actors Guild Award, paving the way for her film career and eventually becoming one of Hollywood’s top leading ladies. Aniston has said that being without clothes in movies is “liberating,” in reference to baring it all in the 2012 film Wanderlust, which she starred in opposite Paul Rudd.

4 Lindsay Lohan

Lindsay Lohan started out as an adorable child actress, taking on the lead role of twins in the remake of the Disney comedy film The Parent Trap. She went on to make other movies under her contract with Disney but began to take on adult roles when her contract ended. Lohan has readily posed for Playboy and appeared in her natural state in the 2013 indie film The Canyons.

3 Lena Dunham

While actresses who agree to go naked in front of the cameras are expected to have perfectly shaped breasts, a flat tummy, and toned thighs, there are those who choose to convey the message that not all women look like models. One such brave soul is Lena Dunham whom we all know doesn’t exactly sport a 36-24-36 figure. But she shows a lot of skin on her TV show Girls, in which she puts on full display her physical flaws, love handles and all. Dunham claims it’s a form of realism and creative expression.

2 Kim Cattrall

Kim Cattrall appeared in some movies in the 80s, but it wasn’t until she took on the role of Samantha Jones in the HBO show Sex and the City that she gained worldwide acclaim. Her character Samantha liberally embraced the show's title theme, and this required Cattrall to have several very risky scenes throughout the series.

1 Caitriona Balfe

Thanks to the critically-acclaimed TV series Outlander, based on the books by Diana Gabaldon, we’ve discovered lead actress Caitriona Balfe. The show features a lot of adult content, but Balfe, who was a model before venturing into acting, says she’s used to getting naked in front of 30 people and is confident with her body. She has no problems baring it all for the show that has catapulted her to fame.

Sources: starpulse.com, cnn.com, people.com, dailymail.co.uk, IMDB.com