Robbie Hart, wedding singer, gets left at the altar by Linda, his fiancee. Later, Linda explains that she can't marry him, because of his job/lack of money. Robbie is upset to the point of ruining someone else's wedding.
Julia, a waitress, needs help with her own wedding. Somehow, she gets Robbie to do it. He inconviently falls in love with her. To make things worse, her fiancee (Glenn) is a womanizing idiot. Julia's cousin (Holly) tells Robbie that Julia's marrying him for money. Robbie tries to get a "real job". As a result, he and Julia get in a fight.
Robbie handles this by getting drunk. Then he decides to tell Julia how he feels, but never makes it to the door, because she looks so happy. Ironically, she is in love with him.
Robbie gets into a fistfight with Glenn. Then Linda comes back, wanting to get back together. Robbie drunkenly agrees.
Julia hears the news from Linda, and decides to get married in Las Vegas. Robbie (after chasing Linda away) goes after her...