AceShowbiz -

John Mayer takes a jab at his ex Taylor Swift while hosting "The Late Late Show" Friday night, February 6. "You can see me at the Grammys doing what I do best, being avoided by Taylor Swift," he joked. "That won't make the Internet at all." The audience responded with laugh.

Mayer, 37, and Swift, 25, briefly dated back in 2009. They collaborated on the song "Half of My Heart". After the messy split, the country/pop singer slammed the "Your Body Is a Wonderland" hitmaker on the song "Dear John", which he called a "cheap songwriting."

"It's abusing your talent to rub your hands together and go, 'Wait till he gets a load of this!' That's bulls**t ... It really humiliated me at a time when I'd already been dressed down," he fired back before later responding with a song called "Paper Dolls".

While he refused to reveal inspiration behind the song, it's believed to target Swift. "Songwriters write songs because of people, about people," he once said. "Anything someone else wrote is their reception of a song. I don't get involved with [it]. It's none of my business."

This coming weekend, Swift will attend the Grammys as a presenter for Best New Artist award, but she won't sing. Meanwhile, Mayer is set to perform and so will on/off-girlfriend Katy Perry who was coincidentally also involved in a feud with Swift.