Alison (Katherine Heigl) takes her sister Debbie (Leslie Mann) out partying to celebrate her new onscreen role on a television entertainment show. He meets Ben (Seth Rogan) who is out partying with his stoner friends. They spend the night together and then, a few weeks later, she discovers that she is pregnant. The film takes them through the discovery and up to the birth with them trying to form a relationship with each other and prepare for a baby.
It’s pretty average. There are certainly fun moments, but there seemed to be no reason for it to go on the way it did. I could not figure out why on earth they would pursue a relationship given how much they really didn’t get along. But luckily, it seemed that having the baby meant they will have a happy life. Whatever.