Caught in the Act!

Ashlee Simpson-Wentz

National Photo Group

updated 12/16/2010 AT 5:00 PM ET

originally published 12/17/2010 AT 6:00 AM ET

• Was she having a good hair night? Ashlee Simpson-Wentz stepped out for a party at the Andy LeCompte Salon in West Hollywood, where the starlet helped launch the Black 15in1 product. The singer wasn’t the only well-tressed star in attendance: Vanessa Minnillo, Taryn Manning and more danced to tunes spun by DJ Lindsay Luv, downing champagne and hors d’oeuvres and writing their winter hair woes on a wall in the salon.

• It was a boys’ night out under the stars at the Los Angeles Zoo and Botanical Gardens while Gavin Rossdale and son Kingston, 4, dropped by a bash celebrating the new Elephants of Asia habitat together. After watching Billy the elephant saunter by the new elephant barn, the father-son duo ate food served in Chinese takeout boxes, snapped a souvenir photo together in the party’s photo booth and visited a kid-friendly glitter-tattoo table. Guitarist Slash also hit the opening-night party with his boys, Cash and London.

• A demure Leonardo DiCaprio, enjoying a pre-theater dinner at Delphine at the W Hollywood with friends. Wearing his trademark baseball cap, Leo had dinner and drinks before heading over to check out West Side Story across the street at the Pantages Theatre.

• Katy Perry, standing on top of a booth and dancing to her own hits “Firework” and “Peacock” while partying at Las Palmas in Hollywood.

• By JENNIFER GARCIA, CARLOS GREER and MARISA LAUDADIO

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