Life happens when you plan how it should look like and how you should live it. Two main characters in this movie are Ben Stone (Seth Rogen) and Alison Scott (Katherine Heigl). Alison is one of the most successful workers in the E! Television. From behind the camera, she gets promoted soon after even getting the job and gets the chance to be on it and do the job in front of the camera. So, she goes out to celebrate with her sister Debbie. Ben is a low life guy who doesn't actually think about anything but booze, getting laid and having fun. So, after Alison's sister goes home, due to her daughter having chicken pots, Alison is left there alone and that is how she meets Ben. After lots of drinking and dancing, they end up in her place for a wild night. Of course, several weeks after, she finds out that she is pregnant and it's his kid. Telling him was the easy part, now comes the comedy and all funny situations. Two of them try to be together because of the baby, and for that to work, Ben needs to grow up and set his priorities straight. This hilarious comedy comes from mind of writer Judd Apatow, who was also the director of the whole thing.