It's a well-known law of physics that if you hold a Madonna concert in LA, celebs will attend in droves. Her Madgesty's show at the Staples Center last night was no exception, and celebs like Jessica Alba, Emma Roberts, Robyn, and even my favorite Backstreet Boy showed up to cheer her on. So, whose concert outfits rocked and whose fell flat? Click through to find out!
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