Kevin Hart brought Stefon Diggs' recent controversial yacht ride back into the limelight at the BET Awards on Monday night ... with a joke we're sure the New England Patriots would have preferred he kept in his pocket.
As the comedian was poking fun at Diddy onstage at the Peacock Theater in downtown Los Angeles by urging celebs to stay way from "slippery" after-parties ... he threw some shade at Diggs and the NFL star's new girlfriend, Cardi B.