Hot Summer Party Nights!

J. Lo gets low! Gerard sings karaoke! Paris pops bubbly! See how the stars spend their hot summer nights

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CHANNING, JENNA & SOFIA

This is one star-studded dance party! Vergara gets jiggy with beau Nick Loeb – just a few feet away from Tatum and Dewan, who show off their Step Up moves at a party for Italy's Ischia Film Festival in July.