Courteney Cox and David Arquette
06/12/2012 at 02:00 PM EDT
David Arquette and Courteney Cox
's marriage is one step closer to being over.
The actor, 40, has filed for divorce from Cox, 47, in Los Angeles Superior Court. The couple announced their separation
in Oct. 2010.
Arquette – who cites irreconcilable differences in court documents filed on June 8 and obtained by PEOPLE – is asking for joint legal and physical custody of their daughter Coco, who turns 8 on Wednesday.
The couple, who wed in June 1999, have remained close despite their split.
"He's my favorite person in the world," Cox told PEOPLE
in January of her Scream
costar. "He's my best friend. No matter what happens in our future, he's my very best friend."
– Dahvi Shira