Amy Adams laid out all the details about her makeout scene with Jennifer Lawrence in American Hustle, even going as far as describing her costar's "soft" and "full lips."

Adams gets naked and kisses Lawrence in the movie, out in theaters Dec. 20. The film also stars Christian Bale and Bradley Cooper, but Adams put the attention on the girl-on-girl action viewers will see if they watch the film.

"She's awesome," Adams told E! News of Lawrence, as she began to talk about their makeout scene. "It's funny because after the first take of that, I ended up with lipstick out to here [gestures all around her mouth]-she has very full lips-and also playing somebody who's not puckering for a kiss, its really interesting how a kiss hits you when you're not participating in it."

"I looked in the mirror, and its meant to be this really dramatic moment, and I can hear her out there laughing and I'm laughing because she pulled back and looked at me and ran out of the room. And I hear her laughing, and I couldn't figure out why she was laughing at first and then I look in the mirror and I'm all serious and I was like, 'Well, that's not gonna work.' I looked ridiculous."

She continues, "Jennifer pulls it off wonderfully because you believe it again as part of the character. It doesn't feel like this salacious, sexual kiss between two women. Its part of her struggle for control."

The actress also revealed that her nude scene in the film was a last-minute decision by director David O. Russell. She added, "I might have had a gin and tonic actually before that scene."

"David threw that at me last minute, too. He didn't give me time to think about it at all. It was the night before, so I got a text or I might have woken up in the morning, saying, 'I think your character might have been a stripper. I think we wanna shoot it.' And its the first day of filming and its the end of the day, so I said, 'Well, as long as you let me look at the scene, I'll do it.' And he did."

Speaking about preparing herself for the resepective scene, specifically in the areas of grooming, she laughed and said, "Well, it was the '70s, so I wasn't that worried. I let it go, just gotta let it go."