Photos: Ashlee Simpson and Pete Wentz Party in Vegas

Finally got some of the pictures from Ashlee Simpson‘s night out in Vegas for Pete Wentz‘ 30th birthday. If you’ll remember, this was the unfortunate night that a photog said something to Pete that just didn’t agree with him, and Pete spit on him. Could the photog have mentioned the whole incident with Michelle Trachtenberg?

Whatever it was, it definitely set Pete off. He spat on him, went to the bathroom to collect his cool, then went out on the dance floor, leaving Ashlee at the table. Rumors said Ashlee was definitely upset. And this was supposed to be a fun night! At least the cake was very cool. It had a picture of Ashlee and Bronx in the center of the “0″.

More pictures after the jump….

Images: Flynet