Jessica Simpson has a new respect for her mom and everyone else who's had a baby. The expectant mama, who appeared on The Tonight Show yesterday to promote her new Fashion Star series, told Jay Leno that she's not due as soon as she wishes and that she's had several middle-of-the-night scares that turned out to be Braxton-Hicks contractions. Jess shared her thoughts on prenatal dressing ("I'm wearing six-inch heels today, and it's a lot of weight to carry on six inches."), her naked cover for Elle (she went behind her dad's back to do it), and her latest craving (slutty brownies). Check out her laugh-filled sit-down with Jay below!