The party of the year! The biggest celebs feted the Met Gala 2015 at New York City's Boom Boom Room, and Us Weekly was on the scene getting all of the scoop -- find out details about Katy Perry and John Mayer's steamy night, Selena Gomez's A-list partying
This article originally appeared on Usmagazine.com: Katy Perry, John Mayer Make Out, Selena Gomez Parties With Reese Witherspoon at Met Gala Afterparty: All of the Details
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