Too tired to ring in '07, Spears makes a comeback with an evening of clubbing at Hollywood hot spot Les Deux. Plus: Justin, Usher and more

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FIT FOR THE JOB

You can call him top banana! Mario Lopez is already gearing up for a new gig while out in Los Angeles on Wednesday. The Dancing with the Stars alum will serve as a healthy role model for Disney's "Say Yes to Fitness" campaign, which encourages teens to make a New Year's pledge to eat right and exercise.