John Mayer Ex-Girlfriend Taylor Swift About A Joke.

Country singer John Mayer, guest server as a Late Late Show, ex-girlfriend Taylor Swift as a joke.

"Make me the best I could at the Grammys, while you can see ...Taylor Swift to be denied. "

He said.

Also Taylor Swift's close friend Ed Sheeran was a guest of the program.

Taylor Swift and John Mayer split up in 2010.After the split, she wrote him a Dear John Swift song.