The Wedding Date (2005)

With the wedding of her younger sister (Amy Adams) fast approaching, Kat Ellis (Debra Messing) faces the undesirable prospect of traveling alone to London for the ceremony. While this is bad enough, Jeffrey (Jeremy Sheffield), the man who left her as they moved closer to marriage, happens to be the groom's best man. Determined to show everyone -- most of all Jeffrey -- that her romantic life is as full and thrilling as ever, Kat hires a charming male escort (Dermot Mulroney) as her date.