Jessica Simpson knows she's doing things backwards, in the conventional sense.

She and fiancé Eric Johnson had one child last year and are now expecting another one this year. It's not because they planned it this way. "We've had two different wedding dates, but he keeps knocking me up," Jessica joked Tuesday on The Tonight Show with Jay Leno (via E! Online). "I'll just keep my legs crossed, I guess, this time," she added.

Jess told Jay she was "extremely shocked" to get pregnant again so soon after the birth of her 8-month-old daughter, Maxwell. "...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!"

This time she plans to eat healthier, since she admits she "didn't really make any healthy good decisions" during the first pregnancy. Read E!'s story for more, including a bit more from Jess on the new show she's developing.

Do you think a couple should get married before having kids, or does that not matter to you?

Source: E! Online