Aniston, 44, who developed a strong friensdship with Cox during their stints in the popular sitcom, said she is been there for me through my thick and thin, reported Us magazine.
"There's absolutely no judgement in Court. You'll never feel scolded. She's extremely fair, ridiculously loyal and fiercely loving.
"I've slept in her guest bedroom a lot. Without giving away too much of my private stuff, all I can say is she's been there for me through thick and thin," Aniston said.
Aniston and Cox, 49, forged a close bond soon after 'Friends' premiered in 1994. Since then, Aniston has gone through a painful divorce with husband Brad Pitt in 2005, and Cox got seperated from David Arquette after 14-year marriage.