Newly single Jennifer Lopez [1] has been busy filming season two [2] of her hit NBC show, Shades of Blue, in New York City. But even with her packed schedule and unfortunate split from her longtime boyfriend, Casper Smart [3], Jennifer found time to support her ex-husband and father to her adorable twins, Marc Anthony [4].

The triple threat surprised Marc's fans at his Radio City Music Hall concert on Aug. 27, taking the stage in a plunging gown and sleek half-up hairstyle for a chill-inducing performance of "No Me Ames" [5] with her talented former love.

"Always fun sharing the stage w this one . . . @marcanthony #NoMeAmes #radiocitymusichall #familia," J Lo captioned a mid-duet photo on Instagram [6] that certainly solidifies their status as the friendliest exes [7]. Keep scrolling to see even more pictures and watch them perform. Once you've seen it all, relive that time they sang together at the Grammys.