Pregnant Jessica Simpson on The Tonight Show

Jessica Simpson wore a low-cut dress for an appearance on The Tonight Show yesterday. Fresh off an extended holiday vacation to Hawaii with her fiancé, Eric Johnson, their daughter, Maxwell, and a rotating cast of friends and family, Jess was ready to chat about her second pregnancy and her various work projects. One of those projects was announced yesterday morning — a Jessica Simpson scripted comedy is in the works at host Jay Leno's network, NBC.

Jessica was her usual funny candid self while talking with Jay about her expanding family. She said that she and Eric, who've been engaged for two years, "had two different wedding dates, but he keeps knocking me up! We're doing it very backwards. I'll just keep my legs crossed this time." As for their having two kids within two years, apparently it wasn't planned. Jessica admitted, "I was extremely shocked because I was going through a lot of hormonal changes, trying to get back to the old, vibrant Jessica. You know, it was kind of like a one-night stand. And it happened all over again!"