Kevin Hart Roast

Dwayne Johnson made a not-so-shocking appearance last night at Netflix's "The Roast of Kevin Hart" ... but then went hardcore, even dropping the R-word, which, if you know his past, is wild.

The movie star was the last person to light into Kevin before it was the comic's turn to throw zingers at everyone else who'd burned him -- and DJ made it count big time.

The short-guy jokes and the quips of talentless-ness were all par for the evening's course -- and even Dwayne hitting on KH's wife was funny -- though not shocking -- but then he dropped the R-word while making fun of controversial NBAer Draymond Green.

If you thought the beef between Pete Davidson and Kanye West was over, then think again ... because Pete may have just poured gasoline on the fire.

Here's the deal ... Pete came out on stage at the Kia Forum in L.A. Sunday night to roast Kevin Hart ... but he also cracked jokes about the late Charlie Kirk, Tony Hinchcliffe, Lizzo and, of course, Kanye.

Aiming below the belt, Pete let it rip, "I was in a beef with Kanye, so I’ve taken shots from better gay Nazis.” 

A-listers gathered on Sunday to roast the crap out of Kevin Hart ... but the comedian wanted to get things started by taking a few shots of his own.

He took the stage at the Kia Forum in L.A. to say he was going to be a good sport while he gets roasted, not a "f***ing bitch" like Tom Brady.

And as he went on and on slamming the superstar QB ... Tom himself stepped out from backstage.