The Black Eyed Peas singer stays on trend in harem pants during a London outing. Plus: Rihanna, Audrina Patridge, Kate Hudson and more

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DUUUUDE!

Rock on! Hugh Jackman straps on a six-string and channels his inner rocker as he hangs backstage with Constantine Maroulis at the former American Idol star's Broadway musical, Rock of Ages, on Thursday. Maroulis recently scored a Tony nomination for his role as a wannabe '80s hair-metal singer.