William Smith is a single, eligible bachelor who has been unlucky in love. He's had only a few girlfriends and recently, no woman would even give him the time of day.Even when he gets lucky and lands a smoking-hot woman as a roommate in his rent-controlled apartment, she hardly even gives him the time of day.Then, one day, Mr. Smith goes to his town library to catch up on some reading when his life changes forever when a little baby girl calls him "Daddy". Suddenly, everyone he knows claims that this little girl he found is, in fact, his baby daughter and suddenly, his smoking-hot roommate claims to be his wife and now William must find out if this is just a hoax or the life that he never knew he had.