The Groom, The Maid of Honor, and The Runaway Bride

A bride runs away from her groom at the altar, but not because she doesn't love him. She's also in love with her maid of honor. They escape together to their honeymoon destination, where things get complicated after a confession of feelings leads to a surprise encounter with the groom. This isn't your typical love triangle, though - it ends in a happy polyamorous relationship.