The former 'N Sync bandmates kick back during their Caribbean vacation on St. Maarten. Plus: Miley, Brad Pitt and more

MUSIC MASH-UP

Rihanna and Justin Bieber hug it out backstage at L.A.'s Staples Center during rehearsals Friday for the Grammy Awards. The up-and-coming pop phenom is scheduled to present an award at Sunday's telecast.

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