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Jennifer Aniston and Courteney Cox have reportedly fallen out over Cox's friendship with her male Cougar Town co-stars.

The former Friends stars have been pals since meeting on the sitcom in 1994, but a source told Us Weekly that 'there's tension', as Aniston, 42, disapproves of her Cox, 46, hanging out with Brian Van Holt and Josh Hopkins while she is still married to David Arquette.

'Jen thinks Courteney is acting callous by running around with this guy but refusing to file divorce papers,' said the insider. 'Like she's playing mind games with David.'

Cox and Arquette announced their trial split in September 2010, and her behaviour is said to have reminded Jen about what she went through during the breakdown of her marriage to Brad Pitt, when he ran into the arms of Angelina Jolie.

'She hates watching Courteney do the same thing,' the source added.