Jennifer Aniston and Courteney CoxIt has been reported that 'Friends' co-stars and BFF's in real life, Jennifer Aniston and Courteney Cox are no longer as close as they once were.

UsMagazine.com is reporting that Aniston and Cox no longer hang out that often and they have not been photographed together in nearly a year. A source has also confirmed that there is "tension" between Aniston and Cox.

The source of the 'tension' is reported to be Aniston's view of Cox's behavior while she is on a trial separation from her husband of 11 years David Arquette.

Aniston does not approve of the fact that Cox is hanging around with her single 'Cougar Town' co-stars Brian Van Holt and Josh Hopkins.