Wedding Crashers (2005)

Divorce mediators John Beckwith and Jeremy Grey are business partners and life-long friends who share one truly unique springtime hobby - crashing weddings! The charismatic and charming duo always have clever back stories for inquisitive guests and inevitably become the hit of every reception, where they strictly adhere to their proven "rules of wedding crashing" to meet and pick up women aroused by the very thought of marriage.

Official website: http://www.weddingcrashersmovie.com/