Vince Vaughn is not happy with Jennifer Aniston and John Mayer’s rumoured romance, according to latest reports.

The Dodgeball actor, who briefly dated Aniston, thinks that she can do a lot better for herself than the rocker, claims that National Enquirer.

Vince allegedly called the Friends star saying: "You can't be serious - this guy is just using you to make a name for himself."

A source explains that Jen was "highly amused by the whole conversation" and "she told Vince that in case he didn't notice, John already had quite a name for himself, with or without dating her, and if Vince didn't like the reports that were surfacing, he should stop reading the papers and spare himself a heart attack!"

Will Jen’s ex-husband Brad Pitt be next in line to make his feelings towards John known?