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Rumor has it that Sir Elton John will be joining Lady GaGa onstage Sunday night for a surprise duet!

Page Six reports that John's been tight-lipped about the rumored onstage hook-up, but we think we can expect another amazing performance out of the pair, like the one Elton surprised us with back in 2001 with Eminem.

I'm not sure what I'm more excited for, what they're going to sing or what they're going to wear!