Christina Aguilera heads to a Radiohead concert at the Hollywood Bowl with her husband in LA

Hayden Panettiere, in bikini, celebrates her 19th birthday a few days late at the pool

Jessica Biel out for a walk around Hollywood hills with the dog

Audrina Patridge heads to her parents house in Los Angeles

Blake Lively celebrates her 21st birthday on the set of Gossip Girl in New York

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