Bride Wars (2009)

Liv and Emma, best friends since childhood, are always there for each other, through good times and bad. Even their respective bridal engagements happen within hours. Together they plan their weddings, each to take place at New York's ultimate bridal destination, the Plaza Hotel. But a clerical error and subsequent clash in wedding dates pits the two brides against each other in a competition that quickly escalates into all-out war.

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