They're both superstars in their own right, and now Lady Gaga and Cher are teaming up their all-star vocals for one highly-anticipated single, a song aptly titled "The Greatest Thing."
Elated at the thought of tapping into the talents of the Mother Monster for her forthcoming lead track, Cher tweeted, "Can hardly wait 4 GT 2 Come Out! Was XCITED 'Bout Making New cd, But Wasn't Expecting BIG Surprises...& THEN...... SURPRISE ! GAGA ! DUET !"