The 19-year-old prompted rumors of a break-up during a concert in Detroit on Sunday, when he changed the lyrics to break-up song "Much Better."
Instead of singing, "Get a rep for breakin' hearts, now I'm done with superstars," presumed to have been a reference to his relationship with Swift, he crooned, "Get a rep for breakin' hearts, now I'm done with movie stars."
He was also missing a necklace the actress had given him as a present.
When approached by E! Online correspondent Marc Malkin to confirm the rumors, Jonas' spokesperson confirmed the split, but insisted, "There is no third party involved."
(c) 2009 WORLD ENTERTAINMENT NEWS NETWORK LTD. All global rights reserved. No unauthorized copying or re-distributing permitted.