- as Ben Stone
- as Alison Scott
- as Debbie
- as Pete
- as Jason
- as Jay
- as Jonah
- as Martin
- as Jodi
- as Charlotte
- as Sadie
- as Alison's Mom
- as Ben's Dad
- as Jack
- as Jill
- as Brent
- as Dr. Kuni
- as Club Doorman
- as Dr. Pellagrino
- as Dr. Howard
- as Samuel - Male nurse
- as Dr. Angelo
- as Female Doctor
- as Young Doctor
- as Wardrobe Lady
- as Alison's Friend
- as Alison's Friend
- as Alison's Friend
- as Fantasy Baseball Guy
- as Fantasy Baseball Guy
- as Fantasy Baseball Guy
- as Ben's Boss
- as Maria
- as Lap Dancer
- as Lap Dancer
- as Herself
- as Himself
- as Himself
- as Himself
- as Herself
- as Himself
Watch "Knocked Up":