By now it should be more than obvious that Jessica Chastain is not only incredible onscreen (she's up for Best Actress in Zero Dark Thirty) but a total style MVP as well. And as we learned on the Oscars red carpet tonight, the fashion world's love affair with Jessica is totally mutual! The flame-haired beauty chatted with MTV on the red carpet tonight about her "fashion-gasm" moment in her nude Armani Privé couture gown. "What I love so much about the dress is that it's a throwback to the glamour of Old Hollywood," she told Josh Horowitz and Janell Snowdon. "It's a Happy Birthday, Mr. President kind of a dress." Um, we'll say! So let's all join Jessica in obsessing over her dress, shall we? Get the scoop from the star herself in the exclusive video below!