While makeup artists and stylists are usually there to make stars look their best, sometimes roles call for their worst.
It took a lot of work to turn the redheaded beauty into a frizzy mess for her role in "The Help." Thankfully, Stone appears to understand the benefits of a flat iron in real life.
Usually we'd want to be anything but "Just Friends" with Ryan Reynolds. The normally chiseled star donned a fat suit for his role in the 2005 film.
(New Line Cinemas/Reuters)
A prosthetic nose, fake teeth and several layers of makeup transformed the British actress into the unfortunate-looking Nanny McPhee.
Before Anne's "The Princess Diaries" character underwent a royal makeover, she was frizzy to a fault. But the not-so-glamorous role still put her on the map.
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The sexy blonde bombshell went grungy, bare-faced brunette for her role as a social worker in 2009's "Precious."
Blonde beauty Cameron Diaz looked harsh for her role as Ms. Hannigan in the "Annie" remake.
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Penelope Cruz's hubby was almost unrecognizable in the Bond film "Skyfall." The makeup was over the top and his contacts and lighter hair color were downright scary.
And this wasn't even the part when he took out his ... well we won't say in case you haven't seen it yet.
But he's not the only actor who has had to play down his natural good looks to play a part.
Click through for some more stars who had to spend lots of time in hair and makeup to look this bad.
The usually buff actor lost almost 40-pounds to play Ron Woodruff, a hard-living man with HIV for the 2013 drama due out in December.
It's quite early, but Oscar buzz for McConaughey has already begun.
Jared's boyish good looks are normally on display on screen, but he went practically incognito when he played Mark David Chapman in 2007. It was hard to believe that it was even him.
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The Aussie actor had originally intended on losing close to 100 pounds for the 2004 role, but directors insisted that a 60-pound weight-loss was more than sufficient to portray the emaciated machinist.
The first name that comes to mind when you think of gorgeous stars looking downright ugly for a part is Charlize Theron. She won an Academy Award for doing so in "Monster."
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When Jon hit the screen as "Napoleon Dynamite" in 2004, audiences didn't really know that the man behind the frizz wasn't so bad.
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The gorgeous blue-eyed blonde was unrecognizable with dark eyes and red frizzy hair in "Being John Malkovich."
Audiences are used to seeing one of People's Sexiest Men Alive as an action hero, but as a fat older dude? That was an adjustment when Matt starred in "The Informant!" (2009)
The critically acclaimed actress looked gaunt and washed out in "The Hours."
Russell went with grey hair and a beer gut to play a CIA officer in "Body of Lies." The fact that he was starring opposite heart-throb Leonardo DiCaprio made him look even worse.
The brunette stunner had to go with a "plain Jane" look for "An Invisible Sign" in 2010. Not surprisingly, even simple and understated looks good on her.
It seems as though Johnny Depp has always played down his looks for his craft. It started back with "Edward Scissorhands" in 1990 and he put on the white makeup again for "Sweeney Todd" in 2007.
In one of his best roles of the last few years, Tom Cruise surprised audiences with a small bit in "Tropic Thunder" and stole the show.