The actress - who voices Princess Fiona in the animated film franchise - attended the Broadway opening of the musical on Sunday (14.12.08) but has no plans to tread the boards herself.
Asked if she would like to play Fiona on stage, Cameron replied: "No. Absolutely not. What they do up there is, to me, impossible. It's wonderful, though. They've done such a great job. They worked really hard, and it really pays off."
Despite her reluctance to take to the stage, the 36-year-old actress had nothing but praise for production.
She said: "It's hilarious. There are so many laughs. It's great to see all the actors playing it together, because when we do it for the animated films, we never see each other. We don't work together."
Cameron is due to reprise her role as Fiona for the fourth instalment of the series, due to be released next year, with Mike Myers and Eddie Murphy - who play the green ogre and Donkey respectively - also set to return.
Other stars who attended the opening included America Ferrera, Joan Rivers and Ben Stiller.
Ben, who was accompanied by his actress wife Christine Taylor, said: "We are 'Shrek' fans at our house. We're going to go check out the musical and let the kids know if it's suitable for children."
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