Seth Rogen is a comedy actor.
Knocked Up is a 2007 American romantic comedy film written , directed , and co-produced by Judd Apatow , and starring Seth Rogen , Katherine Heigl , Paul Rudd , and Leslie Mann . Pineapple Express is a 2008 American stoner action comedy film directed by David Gordon Green , written by Seth Rogen and Evan Goldberg and starring Rogen and James Franco . Seth Rogen . Rogen later got a part on sitcom Undeclared , which also hired him as a staff writer .