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Who's that guy? It's Madonna's 12-year-old son Rocco, who joined her on stage on Tuesday in Philadelphia, the first stop on the North American leg of her MDNA tour. Rocco's dad is Madonna's second husband, British filmmaker Guy Ritchie. (8/28/2012)

Top Shots of the Week

Miss any of the week's most memorable celebrity moments, like Will and Kate doing the wave or Leonardo DiCaprio on the set of his new movie? Check out omg!'s Top Shots!