Watch: Jennifer Lopez, Casper Smart 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 below..