Robert Pattinson has opened up about life as the world's premiere heartthrob - and being joined on his lunch break by 500 screaming fans.

The star has become a target for fans and the world's media since being thrust into the spotlight (and the hearts of the teens and tweens everywhere) by the Twilight movies.

And adjusting to his strange new existence hasn't always been easy.

"I haven't found one place in the world yet where I could disappear," he tells Premiere. "Even the most remote places I can imagine, someone will ask me for a picture with them or an autograph. Honestly, I didn't think that I would be recognised so easily.

"The most embarrassing is when friends ask you to meet up with them and you have to tell them, 'Sorry I can't go to that place' because you're fully aware photographers will be waiting for you there. I feel like such a weasel when things like that happen - like the world has to revolve around me.

"I was in a restaurant during a break, and when I came out two hours later, 500 people were waiting for me at the exit. It was total chaos. But I'm sure that if I'd said to one of those girls, 'Come on, let's go have breakfast,' she would have been totally embarrassed and would never scream my name again."

In what may or may not be a reference to his alleged 'secret' romance with co-star Kristen Stewart, Rob also admits to being paranoid that people are watching his every move.

He adds: "I have to look over my shoulder all the time, be super vigilant because, at any moment, someone could be filming or recording what I'm saying."

Rob and co. at the Teen Choice Awards