Brad & Angelina take twins Knox and Vivienne (not pictured) out in Venice. Plus: Jessica Simpson, Kristen Stewart & Dakota Fanning and more

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INTO THE GROOVE

Justin Bieber busts a move Thursday while performing at the Nickelodeon 2010 upfront presentation at New York's Hammerstein Ballroom. The teen sensation has been hard at work spreading the word about his second album, My World 2.0, in stores March 23.