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.