Hot Summer Party Nights!

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

  • GERARD BUTLER photo | Gerard Butler

Credit: 99.5 WYCD/Splash News Online

Updated: Wednesday Aug 04, 2010 | 06:00 AM EDT By: Alison Schwartz

GERARD BUTLER

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.