Pair said to be collaborating at music event

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Lady GaGa and Sir Elton John are expected to perform together at the Grammy Awards.

The Poker Face singer and Elton, 62, are apparently in the process of finalising a duet.

The prestigious music ceremony takes place in LA on Sunday.

Lady GaGa, 23, real name Stefani Germanotta, is nominated for five awards.

She has previously collaborated with Beyoncé Knowles, 28, on Telephone and Video Phone

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