Couples Watch: Christina Aguilera & Matt Rutler's Vegas Fight Night
09/19/2011 AT 06:00 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.
Expectant parents Hilary Duff and Mike Comrie were spotted enjoying date night with a quick dinner at Sushi Roku Pasadena before catching a movie.
Bachelor Pad's Vienna Girardi and Kasey Kahl are already heating up things in their new kitchen after recently moving in together. Vienna shared how she loved to cook for her "new man" and the duo playfully posed for the cameras at a Pampered Chef Emmy gifting lounge in Hollywood.
By JENNIFER GARCIA, MARK GRAY and GABRIELLE OLYA