Lopez takes a chic stroll in the French city. Plus: Mariah & Nick, Tom & Katie and Taylor Momsen

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J.LO ON THE GO

It's been a whirlwind week for Jennifer Lopez! Days after participating in the Malibu Nautica Triathlon and throwing a surprise 40th birthday party for husband Marc Anthony in New York City, the singer hits the streets Wednesday in Saint-Tropez, France.