Jennifer Lopez Performs 'Dance Again' on 'American Idol'

Jennifer Lopez went from the judging panel to the stage on Thursday’s “American Idol.” The sexy mamacita tore through her RedOne-produced single “Dance Again” with a troupe of dancers including her 24-year-old beau Casper Smart, who lovingly adjusted his girlfriend’s stray hair at the end of her performance. “He’s so cute,” gushed J.Lo. Watch the sizzling set below.

[MWP]