The rapper shoots a commercial in Los Angeles poking fun of himself. Plus: Katie & Posh, Scarlett Johansson and more

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BACK IN VEGAS

Wrapped up in a feather boa, Britney Spears looks ready to start the conga line with new guy Isaac Cohen during a trip to Las Vegas on Saturday. The couple spent the weekend at a $40,000-a-night suite at The Palms, where a source says they seemed "very happy together."