Of course, J. Law, who's rocking a short pixie cut, gave some hilarious TMI when talking about the elaborate costumes, such as her ornate wedding dress. "I had to pee in a bucket, because it couldn't fit over a toilet!" she confessed. "That is hard to do when you can't see."
Jen also discussed what her character Katniss Everdeen's relationship status would be if she had a Facebook account.
"I think her status would always be, 'It's complicated,'" Jen explained, adding that she doesn't have a personal Facebook account. "I've got like 25 unanswered emails and like 97 texts right now," she said. "The last thing I need is Facebook."
Newly single Liam said even if he wasn't famous, he wouldn't discuss his relationships on Facebook.
Watch an exclusive Catching Fire clip below and see the movie when it hits theaters on Nov. 22!