Jessica Simpson just loves showing off her pregnancy curves!

The singer, who is currently pregnant with her second child, was on "The Tonight Show" on Tuesday night -- where she put her growing belly (and growing cleavage!) on display in a tight leopard print dress.

Sporting what looked like newly-dyed hair and black heels, the new mom (and mom-to-be) looked great as she talked about Baby #2.

"I was extremely shocked," Simpson says about getting pregnant again. "It was kind of like a one-night stand and it happened, all over again."

But this time the Weight Watchers spokeswoman has learned from her first pregnancy -- and vows to be healthier this time around.

"The last time I kind of ate everything in sight, I was really happy to be pregnant and I just didn't ever step on the scale," she says. "I gained a lot more than doctors would recommend, but I had fun."

Simpson adds that Weight Watchers has been very supportive of her pregnancy -- with the singer/actress telling the company "Next time around I promise I'll be healthier."

With the second baby on the way, Jessica and fiance Eric Johnson's wedding was once again put on hold.

"We've had 2 different wedding dates, but he keeps knocking me up," Simpson joked. "We're doing it very backwards."

But she's got a strategy that will finally get to the altar: "I'll just keep my legs crossed this time!"

Simpson's appearance on "The Tonight Show" comes after NBC announced she'll be starring in her own sitcom -- click here for more details!

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