Pete Davidson is in rehab just weeks after being charged with misdemeanor reckless driving following a March car crash, ET has learned.A source tells ET that the alum is in rehab for mental health issues and is working to «get back on track.»«Pete Davidson has been in rehab and is being treated for mental health issues,» the source says. «He can be manic and wasn't sleeping well or taking good care of himself, so he decided to go to get help, take a break, and get back on track. Pete is focusing on himself.», who was was first to report the news, says Davidson is being treated at the same Pennsylvania facility where his friend and fellow star John Mulaney sought help for substance abuse issues.ET has reached out to Davidson's rep for comment.Davidson's admission to rehab comes not long after he hit the red carpet for the premiere of his latest film,.