Justin Bieber flipped the bird at the paps as girlfriend Selena Gomez attempted to hide her face from the cameras. Lady Gaga made her runway debut and premiered a song in Paris. Christina Aguilera mean-mugged in her mug shot. Chris Brown went blond and Taylor Swift and Gwyneth Paltrow shimmered in gold. It all happened this week and we've got the pics to prove it.
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