My Best Friend's Wedding (1997)

Julianne and Michael have been friends since childhood and had a pact to get married if they were still single at 28. When he is about to marry his girlfriend Kimberly, Julianne realizes she is in love and plans to attend the wedding to prevent it from taking place, but things don't turn out as she imagined. When it comes to romantic comedies, this is one of the most emblematic and successful of the '90s, with Julia Roberts and Cameron Diaz displaying all their charisma and a most memorable buddy, played by Rupert Everett.