Zoe quit as a wedding photographer when her fiancé left her just before their planned wedding. Now, she photographs pets instead and enjoys it. However, when her friend is getting married, she is persuaded to step in as the photographer anyway. But she only arrives at the wedding festivities when she realizes that, despite being promised otherwise, her ex is there with his new girlfriend. She is partially saved by Clark, one of the wedding guests, who pretends to be her boyfriend so that Zoe doesn't have to face her ex alone.
A better version of the 'pretend-to-be-together' theme. They manage to add some good twists.