If you peeped Charlie Puth's Instagram Story [1] over the weekend, you may have noticed some familiar faces! The Fitness Marshall [2]'s latest video is to Charlie's new hit, "How Long." Needless to say, we're going to be dancing to this infinitely.

You may have also noticed a surprise guest backup booty! That's Will Ontiveros from season one of Revenge Body [3]. Lookin' good, Will!