(Cover) - EN Showbiz - Seth Rogen says eating healthily to prepare for his new movie was a nightmare.

The actor stars in The Green Hornet and had to lose a lot of weight in order to play the superhero. Seth admits he loves indulging in junk food and found it a challenge to embark on a diet to help him shape up.

However, once he did improve his eating habits the weight soon began to fall off.

"It wasn't that difficult, honestly. I think I was so unhealthy before that just by becoming incrementally healthier, the pounds washed away, he told ET. It sucked. Eating well, that's a nightmare. Who wants to eat healthy food all the time? I mean, it's like insane."

Seth went on to reveal how nervous he felt when he and director Michel Gondry met Cameron Diaz to convince her to play Lenore Case, the secretary of the Green Hornets alter-ego Britt Reid. The funnyman was eager to make a good impression and has compared his meeting with the Hollywood star to a first date.

"We wanted to impress her, and we both have to win her over," he explained. "It was pretty funny."

"It was really cute," Cameron teased, "I didn't really need to go. They had me at 'Hey.'" (C) Cover Media