Jennifer Lopez has sparked rumors she and ex-boyfriend Casper Smart are back together after sharing a public kiss with the dancer after her appearance on American Idol on Wednesday night (25Mar15).

The former lovers locked lips outside J.Lo's trailer on the studio set just before they left in the same car, nine months after the couple split.

The new photos of the pair together come just days after Smart was spotted on the red carpet at his ex-girlfriend's new movie Home on Sunday (22Mar15). He even carried her son Max after he grew impatient with the paparazzi as they took photos of his mom.