• Kevin Federline, celebrating his 31st birthday with girlfriend Victoria Prince at M2 Ultra Lounge in New York’s Meatpacking district. Hurrying to his private table in the back, Federline (whose birthday was March 21) spent his night dancing and kissing Prince, always keeping her in reach. He also partied with the Kardashian sisters – sans Kim – and a birthday cake glittering with sparklers.
• More from the party hats department: Avril Lavigne threw hubby Deryck Whibley a surprise 29th birthday barbecue at their Los Angeles home. “Deryck seemed totally surprised and Avril hugged and kissed him after the big reveal,” a source tells us. “The two held hands and were touchy and affectionate throughout the party.” Meanwhile, 30 guests (including Katy Perry) drank Belvedere IX cocktails and enjoyed light bites – all to a punk-rock soundtrack.
• In Austin for South by Southwest, Drew Barrymore rocked out in the front row as The Airborne Toxic Event played a showcase at Aces Lounge – and the actress was singing along to every song, a source says. The actress also stopped by the Nintendo Lounge for a beer with friends. Also spotted at SXSW: Rocker Perry Farrell, pumping his fist in the VIP section at Stubb’s Bar-B-Q for Metallica‘s secret show for their video game, Guitar Hero: Metallica.
• Anne Hathaway, catching the risqué puppet show “Puppet Up! – Uncensored” at the Avalon Hollywood with friends. The smiling actress skipped the booze for cranberry juice, and “was in a really great mood: friendly, very polite and getting a kick out of the show,” an onlooker says.
• Seth Rogen and girlfriend Lauren Miller, enjoying a sweet ending to their steak dinner at Morton’s The Steakhouse in Beverly Hills: a piece of New York cheesecake. Before sitting, Rogen grabbed a Shirley Temple in the bar.
• By SHERMAKAYE BASS, JENNIFER GARCIA, ALLIE GROSS, MARISA LAUDADIO and LESLEY MESSER
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