The film begins with Jim Levenstein and Michelle having dinner,
celebrating their college graduation. Jim intends to propose to Michelle, but
receives a phone call from his dad, who says he forgot to give Jim the wedding
ring and was on his way. As Jim tries to stall, Michelle gets the impression that
he wants a public sex act, and proceeds to perform oral sex on him under the
table. When Mr Levenstein arrives, Jim tries to hide the fact that he’s being
fellated. Not knowing Michelle was under the table, Jim’s dad expresses his
excitement at the proposal. Then, after Michelle bumps her head under the table
in shock at hearing about the proposal, all chaos ensues as Jim ends up exposed
and has to hike his pants up quickly. Saving face, he swallows what’s left of
his pride and asks Michelle to marry him. She says yes.

As planning begins, Jim worries that the wedding will be a disaster.
Michelle’s parents hate him after an accidental scene in which Jim appears to be
having sex with their two dogs. Michelle’s wedding dress is made by only one
designer working for one store, so Jim sets out to find the dress maker for her.
And Jim can’t dance, but salvation comes in the form of Stifler, who took dance
lessons. However, Stifler only teaches Jim to dance on the condition he allow
Stifler to attend the wedding (Jim and Michelle had planned to leave Stifler in
the dark about the whole event, but he found out accidentally after crashing
their engagement party), and that he gets to plan the bachelor party