In the classic film, Mulroney plays Michael, the suave, childhood best friend of food critic Roberts' Jules. Although Jules still harbors a crush on Michael after many years, he shows up engaged to 20-something billionaire Kimmy (Diaz), and she hatches a plan to get him back.

My Best Friend’s Wedding, directed by P.J. Hogan, follows a woman who realizes she’s in love with her longtime friend after he announces he’s engaged, leading her to try and win him over just days before the wedding.

Mulroney teased to The New York Times that he “was sitting there ready for the gift with purchase that was supposed to come along with being in a popular movie.” However, he claimed that “instead, [he] probably didn’t work for a year” afterward.