Jessica Simpson Throws Her Fiancé a Birthday Bash
09/19/2011 AT 10:00 AM EDT
Jessica Simpson and fiancé Eric Johnson celebrated his 32nd birthday with a party at L.A.'s Bru Haus. Among the 40 people in attendance: Ashlee Simpson and boyfriend Vincent Piazza, Jessica Alba and Cash Warren. Guests enjoyed a selection of food, including BBQ pulled pork sliders. Ashlee spent a lot of time on the dancefloor, while Jessica and Johnson focused on being good hosts and talking to all their guests. "Everyone was having a great time," said an onlooker.