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It is not known what the colorful couple will be performing together, but website HollyScoop.com insists the Grammy get together will be "the coolest collaboration ever".
A source says, "Elton and Lady Gaga on the same stage is sure to create fireworks, it could be one of the most memorable Grammy performances of all time."
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It won't be the first time the "Rocket Man" has performed a headline-grabbing duet at the Grammys. In 2001, he shared the stage with rapper Eminem.
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