Ashlee Simpson helped throw Pete Wentz a lavish birthday party in Vegas on Saturday night after the couple celebrated with her family in LA the night before. Bronx stayed home in California while mom and dad headed to the Bank nightclub at the Bellagio, but he still got to be a part of the sweet celebration in a photo on the 30th birthday cake. The next morning Pete and Ashlee were headed back to LA for the A Time For Heroes celebrity charity carnival, where they brought their little man Bronx along to enjoy the sights.

Flynet, Splash News Online, and WireImage

To see more of Pete and Ashlee in Vegas, just