J. Lo gets low! Gerard sings karaoke! Paris pops bubbly! See how the stars spend their hot summer nights
Credit: Rob Loud/Getty; Mark C. Austin/Startraks (inset)
Updated: Wednesday Aug 04, 2010 | 06:00 AM EDT
By: Alison Schwartz
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She's his No. 1 fan: Beyoncé feels Jay-Z's beat, while the rapper tears up the stage at June's Bonnaroo Music and Arts Festival in Manchester, Tenn.
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