The couple kick off a joint celebration in Los Angeles. Plus: Britney Spears, Kevin Federline and more

NEW YORK NIGHT

Britney Spears works the little black dress as she heads to New York City's Sony Music Studio around 2 a.m. Wednesday – the same time estranged husband Kevin Federline was working the crowd onstage in Chicago and touting his soon-to-be single status.



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