christina aguilera 300 Couples Watch: Christina Aguilera & Matt Rutlers Vegas Fight Night

Matt Rutler and Christina Aguilera

Richard Young/Startraks

• Christina Aguilera and boyfriend Matt Rutler had a ringside view as they watched Floyd Mayweather Jr. knock out Victor Ortiz at Las Vegas’s MGM Grand. The couple sat near True Blood‘s Stephen Moyer and wife Anna Paquin, as well as Mark Wahlberg. Following the fight, Aguilera and Rutler headed to Tao Las Vegas for dinner and dancing.

• 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

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