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Jessica Chastain, Oscars 2013

Jason Merritt/Getty Images

Oscar nominee Jessica Chastain played a tough-as-nails CIA agent in Zero Dark Thirty, so we've loved seeing her softer, often-beaded side during awards season.

"I'm such a fan of movies, I love cinema so much," she explained to E!'s Ryan Seacrest on the Oscars red carpet tonight, dishing the details on her nude Armani Privé couture gown. "It's a very 'Happy Birthday, Mr. President' kind of dress. It reminds me of old Hollywood glamour."

Consider her Marilyn card stamped!

Chastain admitted it was "a very tough decision" picking out a dress this year, especially because so many more options were on the table now that she's a Best Actress nominee.

"This year, it's like I can see clearly now—and I'm nominated for an Oscar! Oh my god! she exclaimed, comparing this year to last (when she was also nominated for an Oscar, albeit Best Supporting Actress, for The Help). 

Along for the red-carpet ride tonight was Chastain's grandmother, who said she couldn't be more proud. "Twice in two years? This is so cool," the cool Michael Kors-clad granny told Seacrest.

Showing off her Harry Winston bracelet for E!'s mani-cam, Chastain said the baubles would indeed have to go back tomorrow morning. But, she added, "We'll see if they can find me at 10 a.m."