Caught in the Act!

Caught in the Act!
Katy Perry
Kevin Mazur/WireImage

03/27/2009 AT 06:00 AM EDT

Katy Perry, sipping on Grey Goose sake-style cocktails while celebrating her drummer Adam Marcello's birthday at new Asian eatery Sunda in Chicago. The singer – who was in the Windy City to perform at the House of Blues – feasted on spicy tuna and Chilean sea bass and chatted up chef Rodelio Aglibot as she partied with her band in the restaurant's private room. And when the birthday cake came out, the animated singer excitedly snapped photos with her camera phone.

Justin Timberlake, treating himself to a Pinkberry yogurt in Beverly Hills after a game of golf. Wearing a hat, sweatshirt and sneakers, the singer ordered a medium-sized original blend with white chocolate shavings and took it to go.

Anne Hathaway, giggling with pals following dinner on the patio of the Chateau Marmont in West Hollywood. The Oscar nominee – dressed casually chic in a fitted black leather jacket, skinny jeans and boots – grinned as she walked arm-in-arm through the lobby with a male friend.

Tobey Maguire, congratulating director-choreographer J.T. Horenstein after checking out his indie-rock ballet The Question at the Ricardo Montalban Theatre in Hollywood. The Spider-Man star attended the production, which is based on Horenstein's experience serving on a jury of a murder trial, with a male pal. Horenstein will also appear as a dance teacher in the upcoming version of Fame.

Paris Hilton and Kathy Griffin, strutting their stuff in bikinis as they made their way to a poolside cabana at the Avalon hotel's Blue on Blue restaurant in Beverly Hills. Before heading to the pool, the hotel heiress checked herself in a mirror – with several people complimenting her on how she looked. Griffin, whose hangout session with Hilton was being filmed for an upcoming episode of her Bravo show My Life on the D-List, got laughs by responding, "Thank you!" Once outside, the unlikely BFFs (who also shopped that day in West Hollywood) ran into Terrence Howard, who gave them both a hug and kiss on the cheek.


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