Jennifer Aniston's Friendship with Courteney Cox has reportedly become ''strained'' since she started dating Justin Theroux.

The pair have been inseparable since meeting at the 'Friends' audition in 1994, but Courteney apparently feels Jennifer has ''forgotten'' about her since moving in with Justin.

A source said: ''Jennifer's priorities have obviously changed since meeting Justin.''

Courteney, 47, supported Jennifer through her 2005 divorce from Brad Pitt, and often invited her to holiday with husband David Arquette and their seven-year-old daughter Coco.

But the 'Scream' actress is now alone having separated from David in 2010, and is said to be feeling neglected by her loved-up best friend.

The source added to Grazia magazine: ''Courteney must feel that Jen has completely forgotten what it's like to be the single girl and that will hurt given how supportive she and David were to Jen over the years.''

Meanwhile, Jennifer has a new demand on her time having adopted a brood of chickens.

The 'Switch' star - who recently moved back to Los Angeles from New York - inherited a chicken coop with her new home and has decided to learn all about her feathered friends.

And the 43-year-old actress has so far learned The Birds have some unusual tastes.

She told the Globe: ''They're very social animals, and they like it when you visit them with a cup of coffee in your hand. And according to my groundskeeper, they love pasta.''