New Delhi, Jan 29 (ANI): Jennifer Aniston has praised her former costar and friend Courteney Cox and said that she has been there for her through thick and thin. The 'Rumor Has It' star told More Magazine that the 'Cougar Town' star is extremely fair, ridiculously loyal and fiercely loving, and added that she has slept in her guest bedroom on several occasions. Aniston and Cox had starred together in the hit series ' F.R.I.E.N.D.S.'