After celebrating with Mayer, Simpson hits the streets of N.Y.C. to film Blonde Ambition. Plus: Patrick Dempsey, Nicole Richie and more

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Wrapping up his tour with a final show at New York's Madison Square Garden, John Mayer gets down to the business of celebrating with his No. 1 fan – Jessica Simpson – at the Level Vodka afterparty at Stereo on Wednesday. The affectionate duo spent the night kissing and dancing in the VIP area, says a clubgoer.

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