KNOCKED UP star Seth Rogen finds it tough watching TV show ENTOURAGE - because his idea for a similar inside-Hollywood expose series was turned down by the same network bosses who greenlighted MARK WAHLBERG's project.

Wahlberg's show has become a huge success and Rogen can't understand why HBO bosses didn't pick up on a similar idea he pitched them years before.

The 26-year-old tells Eonline.com, "I just remember feeling really bitter. We thought the stuff we were writing was funny... and it just seemed crazy that no one else liked it.

"You start to question your own sanity. Like, 'Our HBO pilot isn't funny, but Entourage is?'"

Rogen insists the idea he came up with with his Knocked Up co-star Jason Segel would have been a huge hit: "We all used to smoke weed all day instead of working, and we'd just play video games for months on end. But we all really wanted to work and make movies."