Pete Davidson is rebounding from Ariana Grande by getting with Kate Beckinsale -- who's almost twice as old as Ariana and probably twice as hot.
Davidson's good buddy Machine Gun Kelly approves of the May-December romance between the 25-year-old Pete and 45-year-old Kate.
"I love that s***...that s***'s tight," MGK said when TMZ asked.
Then he theorized that Beckinsale likes younger guys because "we rock."
Speaking of younger guys, Beckinsale dated comedian Matt Rife a couple of years ago when he was 21. When he was asked about Davidson and Beckinsale he told his fellow funnyman to "run."