Friday, January 29, 2010 3:27am ET by  
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Lady GaGa, Elton John for Grammys duet

Lady GaGa and Elton John will reportedly perform together at the Grammy Awards on Sunday. The pair are rumoured to be working on a duet for the annual event, which is held at the Los Angeles Staples Center on January 31.

Details are yet to emerge about which song the twosome will perform, however reports claim that it will be one of the most "memorable" in the ceremony's history. Sir Elton refused to dispel the rumours when he was quizzed on the plans at the Sundance Film Festival in Utah this week, Metro reports.

"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," Contactmusic quotes a source as saying.

Watch Lady Gaga talk to Barbara Walters on 20/20 below: