Producer RedOne has described the forthcoming duet from Lady Gaga and Cher as a 'party'.
Cher revealed last month that Gaga would duet on the track, telling fans over Twitter: ''Can't wait till GaGa puts her Voice on "The Greatest Thing" SHE WILL ROCK IT SO FKNG HARD! (sic)"
The collaboration has now been confirmed as the lead single from Cher's new album. She told fans over Twitter that the 'The Greatest Thing' will be released in SEPTEMBER."
Speaking about the collaboration, producer RedOne told MTV: ''[Gaga and I] recorded the song a few years ago, and we were always in the studio enjoying that song. It's weird we never did anything with it. So I remember my management and Cher's management were trying to get us together, and I thought, 'Oh my God, I'd love to meet Cher, just to meet her!'
"And so I met her, I played her some songs, and I played her 'The Greatest Thing,' and she loved it. She said, 'This is my song,' I said, 'Yes, it's your song.'"
He continued: "I cut the vocals with Cher first, and I was in Madrid and got a text from GaGa saying, 'I'm thinking about jumping on the song in the remix. I was like, 'No, you should jump on the original! Make it a duet.' She said, 'Oh yes, OK, absolutely,' and then I spoke to Cher, and it became a party."
He added: "Everybody loved it. GaGa on it, Cher, two big icons, [they are] part of music history. So it happened. I'm very happy to be a part of this."
An early demo version of 'The Greatest Thing' appeared online last year.
Creating Lady Gaga
You can keep up to date with all the latest news from Gigwise by following us on Twitter and liking us on Facebook.

Michael Jackson's Doctor To Go On Trial Today (September 27)
Happy Mondays' Bez Missed Out On Date With Julia Roberts
Radiohead Accused Of Being Motivated By Greed On Colbert Report - Video
Billy Corgan Hints That Smashing Pumpkins Could Be Over If New Album 'Oceania' Fails
Simon Cowell Slams Lady Gaga, Beyonce and Katy Perry As 'Boring'
Lady Gaga Duets With Sting At iHeartRadio Festival - Video
IHeartRadio Festival 2011: Photos With Lady Gaga And Nicki Minaj
Lady Gaga Dedicates Song To Bullied Fan Jamey Rodemeyer At iHeartRadio Festival - Video
Doctor Who Christmas Special: Photos From The Set
Morning Parade Play London's Scala
As Steel Panther Get Their 'Balls Out': The Sexiest Album Covers Ever