Earlier Jennifer Lopez seemed to be having a bit of a rivalry with Jennifer Garner, after she started dating and later married her boyfriend Ben Affleck.
But that is a thing of the past. Now it's Jennifer Aniston she's feuding with and it's for purely professional reasons.
They have come to loggerheads over their upcoming films, both focusing on single women wanting to be mothers.
According to Daily Mail online, the stars have been squabbling for sometime with Lopez accusing Aniston of stealing the idea.
Reportedly Lopez will return to acting with 'Plan B' after taking a break from films to become a mum, is worried that Aniston's film will steal the thunder from her comeback film.
The source said: "The last thing J-Lo wants is to have Aniston overshadow her. There's been some mud-slinging, with J-Lo claiming Jen took her idea."
Both Plan B and the movie Aniston is making and shooting for currently called 'Baster' revolves around single women trying to get pregnant as their biological clock ticks away
Let the match begin. Only the Box Office will decide who wins eventually.