ET's with Jim Carrey, his girlfriend Jenny McCarthy and more for the world premiere of Disney's 'A Christmas Carol' in London’s Leicester Square, where Jim dishes about his festive animated film and hilarious holiday memories.

"When you get a chance to do great literature with an amazing cast … and a director with a vision and a track record of doing beautiful stories, you’ve just got to count your lucky stars," Jim tells ET.

"His performance is a tour de force. He’s the best Scrooge ever," raves director Robert Zemeckis.

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