Isla Fisher keeps baby Olive warm in New York. Plus: Lindsay Lohan, Zac Efron, Paris Hilton and more

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WHAT A ROUTINE!

Britney Spears takes a break from rehearsing at the Millennium Dance Complex in Hollywood Monday after teaching an hour-long dance lesson – with choreographed routines to vintage Madonna songs – to a group of six kids. "The class was amazing," Robert Baker, director of the Millennium Dance Complex, tells PEOPLE.

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