Have I fallen in love with the man who will be my brother-in-law?

Jessie's twin sister, Jenna, has her wedding in one week, and she went AWOL! She begs Jessie to take her place before her fiancée, Mac. Jenna is a perfectionist compared to Jessie, a tomboy. They may look the same, but their personalities are total opposites. Can she really pretend to be her? Jessie does her best to play her sister's part, but eventually her heart is taken by Mac's refined and sexy charisma. She knows she shouldn't... How could she fall for the man who is meant to be her brother-in-law? Jessie does her best to suppress the yearnings of her heart, but then she discovers a secret behind her sister and her fiancée's wedding...