Kelly has spent her life taking care of her grandmother and being responsible, but she decides to have a little fun for one weekend in Vegas. She doesn't expect to wake up married to her best friend, Peter--and not remember anything about it. Peter has been in love with Kelly for a long time, but she's never looked at him as anything but a friend. He's thrilled when she seems to want him for a husband--until he finds out she didn't know what she was doing. Not wanting to let her go, he convinces her to stay married to him for a month and a half to appease their traditional families. Now he has only forty-five days to prove to her that they should stay married for good.