After performing at L.A.'s Staples Center with guest Eminem
had beau Matt Kemp
by her side for a late-night bash at Drai's in the W Hollywood. Arriving after 1 a.m., the pop star was delivered a cake with sparklers. She also shared some smooches with Kemp, and listened as rapper Lil Jon
performed his hits for the crowd. Also there: Brody Jenner
and Avril Lavigne
, who hung out in the outside, back bar with friends.
Meanwhile, in Long Island, N.Y., John Mayer
was serving ice cream to his fans before his concert at the Jones Beach Theater. The rocker threw on an apron and tooled around the venue's parking lot in a Ben & Jerry's truck, handing out free samples as fans tailgated and waited for concert gates to open.
, stepping out for a casual breakfast meeting with a British male pal at Hugo's in Studio City, Calif. The actress was energetic and chirpy but also business-like, though she kissed her male companion on the cheek before strolling out of the restaurant.
Mom-to-be Ali Larter
spent the afternoon lunching at La Scala in Beverly Hills with friends before going baby clothes shopping at Marie-Chantal baby boutique. "Ali knew exactly what she wanted and picked up newborn clothes in blue and white," a source says, adding that she was "oohing" and "aahing" while browsing the wares.
By PERNILLA CEDENHEIM, JENNIFER GARCIA, SARAH MICHAUD and ABBY STERN