Jessica Simpson appeared on The Tonight Show on Monday, and the 31-year-old singer/actress chats about pregnancy cravings, her nude Elle cover and her new show, Fashion Star.

But that's not all! Jess also pokes fun at her fuller figure, joking that she can't wait to have her old "gut" back, and she delivers a solid dose of TMI when she reveals a nickname she gave herself while working up a sweat shooting her new NBC series. "I just started calling myself 'swamp *ss,'" she told host Jay Leno. "Like, I have swamp ass right now. I had major swamp *ss because I was wearing these Spanx to hold in my gut ... we're under these hot lights and it's like the bayou up in that ... so it's very humid in there!"

While that may be a bit of a turn off, Jess revealed that her sex drive has hit an all time high during her pregnancy. Jess called in to Ryan Seacrest on his KIIS FM radio show this morning and declared that she's "unstoppable in the bedroom." I guess Eric Johnson is a lucky guy!