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The Twilight star says Middleton's life will be hard.
The British actor has said that people will lay responsibilities on the bride that "will seem totally irrelevant".
"As an actor you can kind of mess up, but not if you are a royal" said Pattinson "I've always liked the members of the royal family who couldn't care less what anyone thinks" said the star.
Robert Pattinson is currently completing the last Twilight Saga installment, Breaking Dawn - Part 2.