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Lady Gaga Records Duet With Cher

Lady Gaga, Cher
Kevin Winter/Getty Images

"Who knew a year ago when I was crying in her arms after she gave me an award, that today we would" collaborate on "The Greatest Thing," writes Gaga on Twitter.

Lady Gaga and Cher recorded their duet "The Greatest Thing" on Tuesday, both singers announced on Twitter.

"Who knew a year ago when I was crying in her arms after she gave me an award, that today we would record a duet. @Cher You are The Greatest," wrote Gaga, referring to Cher presenting her with a "Video of the Year" Moonman at the 2010 MTV Video Music Awards -- when Gaga memorably wore a dress made of meat.

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Added Cher, "Can hardly wait 4 GT 2 Come Out! Was XCITED 'Bout Making New cd, But Wasn't Expecting BIG Surprises...& THEN...... SURPRISE ! GAGA ! DUET!"

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Cher announced on Twitter that the Gaga-penned track will be released in September.

"I wrote that song a long time ago, and I've never put it on one of my own albums for, really, no particular reason," Gaga told MTV News. "I always write these concept records, and it just didn't fit in. But it's always been, like, this big, massive, beautiful hit record and everyone always says, 'Why don't you put that on your album?' And I said, 'I don't know, it just doesn't fit with everything else."

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"Cher heard the song and loved it and wanted to do it together. And I said, 'F--- yeah, it's Cher!" Gaga went on. It will be the lead single off Cher's 26th studio album.