“Twilight’s” Robert Pattinson was the life of the party at the MTV Movie Awards last night (June 5), running through the audience to kiss castmate Taylor Lautner, much to the chagrin of girlfriend Kristen Stewart, and dropping the F-bomb on his other castmate Reese Witherspoon.

Pattinson won awards for Best Male Performance, Best Kiss with Stewart and Best Fight Scene. “The Twilight Saga, Eclipse” also won Best Movie.

Stewart was nominated for kissing both Pattinson and Lautner — but a memorable replay of the movie scene occurred between Rob and Taylor at the show.

Rob ran down the aisle, climbed on Taylor’s lap and gave him a huge hug and wet kiss on the cheek.

Rob was also called on stage to pay tribute to Witherspoon, who won MTV’s Generation Award.

Chelsea Handler and Patrick Dempsey joined Rob on stage. But the “Twilight” star upstaged both with an off-kilter joke.

He played off his part in the movie “Vanity Fair,” in which Reese played his mother, and their roles as lovers in “Water for Elephants. ”

He chastised Reese for being responsible for cutting his only scene from “Vanity Fair” (“not true” she mouthed) and then noted the he was her lover in “Water for Elephants.”

“I didn’t cut you out, but I did f*ck you,” he said in an obvious double entendre.

The expletive sailed right by the censors and was heard by the studio audience and viewers at home.

Rob expressed disbelief that he bungled the punchline of the joke, but Reese was only too happy to correct him when she took the stage.

“By the way, Rob, the punch line to your joke was, ‘I played your mother,’ then we had a sex scene, so really you’re the best mother f*cker in Hollywood.”

This time, though, the censors were ready and bleeped out Reese’s F-bomb. MTV blamed Rob’s miss on a technical glitch, and it was cut out of feeds.

But you can relive the moment below, along with Rob’s long kiss with Taylor.