Wearing a stunning Armani Prive beaded dress, Oscar nominee Jessica Chastain looked the polar opposite of her CIA agent character in Zero Dark Thirty.
"I'm such a fan of movies, I just love cinema," she told Ryan Seacrest of the inspiration for her dress. "It's a very 'Happy Birthday, Mr. President' kind of dress."
"It reminds me of old Hollywood glamour."
Channeling her inner Marilyn wasn't an easy call.
Chastain admitted it was "a very tough decision" picking out a dress this year, given the number of options on the table now that she's a Best Actress nominee.