She went from Marilyn Monroe to Marilyn Manson.

According to That's Fit, Scarlett Johansson has been doing some serious dieting for her upcoming role in Iron Man 2. 

Just last month she was quoted in In Touch as saying she'd never dieted and or set foot inside a gym. It's not like she always sat around eating cookies -- she has simply made a point to eat well and walk a lot, at least, until now. 

Suddenly, ScarJo is noticeably slimmer, and was overheard talking to fellow actress Thandie Newton about the rigid diet she's currently following, apparently in order to get ready for Iron Man 2.

What the hell? Did some fool seriously tell the woman owning the rear-end from the opening scene in Lost in Translation that she was too chunky? Hollywood is messed up. It's not like anyone was complaining. She was Esquire's 2006 "Sexiest Woman Alive," for Pete's sake.

I'm wonder if it was the same guy who made Angelina Jolie wear a padded bra in Tomb Raider.