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."

Lovely night at the 30th annual Producers Guild Awards. Everyone got a free quite sleek egg timer which does make you feel a bit like dancing #producersguildawards

A post shared by Kate Beckinsale (@katebeckinsale) on Jan 20, 2019 at 2:00pm PST