The Wedding Singer ending explained (spoilers)

[RafaelDet 0]

Robby finds out that Julia and Glen are going to Las Vegas to get married. He gets on a plane to go to Las Vegas and stop them. He doesn't know where he's going to find them, but he finds out that they are on the same plane. He is also on the plane with Billy Idol who gives Robby a guitar so that he can sing to Julia over the intercom. Robby sings to Julia about growing old with her, and Glen gets mad, tries to go after Robby but gets ambushed by a biker and Billy Idol and locked in a bathroom. They get married and they have the drunk best man from the beginning of the movie, who finally learned how to play guitar, playing at their wedding.