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Rex Features
The pair were spotted shooting a promo for the song in New York last week, sparking rumours that GaGa features on a remix of the upcoming track.
"Everything on the set was being kept very hush-hush, and security was extremely tight," a source told Life And Style.
"In the video, Beyoncé wears a feathered dress. And of course Lady GaGa wears something wild. The fashion is sick and insane."
According to MTV News, a spokesperson for music director Hype Williams confirmed that both Beyoncé and GaGa feature in the video, which was shot at Brooklyn's Greenpoint neighbourhood.
The duo's management are yet to provide further details about the collaboration.
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