Courteney Cox and David Arquette
01/10/2012 at 08:00 AM EST
They may be the happiest unmarried couple in L.A.
"He's my favorite person in the world," Courteney Cox
told PEOPLE of her estranged husband David Arquette at the Cougar Town
TCA party. "He's my best friend. No matter what happens in our future, he's my very best friend."
Cox and Arquette, who separated in fall 2010
after 11 years of marriage
, remain close and together run their production company, Coquette Productions, that has some art-imitating-life projects in the works.
Cox tells PEOPLE, "We sold one show, Ten Year
, about a couple who separated after 10 years of marriage. It's not really about David and me, but it's something we related to and we thought we should tell a story about people who could actually get along after being separated. It's telling a different version."
As far as Arquette's recovery
after rehab for alcohol abuse
, his No. 1 supporter
says they just celebrated a milestone. "[We went out to celebrate] David's one year of sobriety," Cox says. "He's great. Good for him."