J. Lo gets low! Gerard sings karaoke! Paris pops bubbly! See how the stars spend their hot summer nights
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Updated: Wednesday Aug 04, 2010 | 06:00 AM EDT
By: Alison Schwartz
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Butler reigns supreme over the sound machine at Rockstarz Karaoke Bar in Garden City, Mich., in July, where he belted out '80s tunes with Machine Gun Preacher costar Michelle Monaghan.
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