Pattinson will be watching the nuptials on TV as he finds the royal wedding "fascinating" but he fears Middleton has a difficult time ahead of her once she becomes royalty.
He tells Britain's Radio Times magazine, "It's going to be hard (for her) because people will lay responsibilities on her that seem totally irrelevant. You can't mess up, either. As an actor, you can kind of mess up - but not if you're a royal.
"I've always liked the members of the royal family who couldn't care less what anyone thinks: the ones who go, 'I'm royalty - so shut up!' That's one of the coolest things about England, I think, that we still have this crazy old system in place...
"I'll definitely be watching the royal wedding. I mean, they're absolutely obsessed with it in America, it's insane... but I guess it's kind of a big deal. Actually, I think it's really sort of fascinating."