Hot mama!

Jessica Simpson threw son Ace Knute a dinosaur-themed 3rd birthday party yesterday, and the fashion mogul dressed for the occasion in a leaf patterned crop top and matching shorts. Look at that waist and those boobs! It feels like just yesterday the blonde bombshell was struggling to drop the baby weight, and now look at her!

The mother-of-two has been largely out of the spotlight as she raises her two kids with husband Eric Johnson, but rumor on the street is that she wants a Britney-type situation with a Sin City residency!

"She’s hell-bent on landing a Vegas residency. With state-of-the art technology and backdrops paired with her sex appeal, she thinks she can give the other headliners a run for their money. After 20 years in the music business, Jess is excited to follow her dreams and become a Vegas legend," a source dished to In Touch.

We're waiting for her music comeback!