Courteney Cox and David Arquette have separated after 11 years of marriage … and TMZ has learned they’ve been separated for several months. A source close to the couple tells us the two are “still friends” and they maintain a business relationship with each other. In fact, sources tell us … no lawyers are involved.

The couple has one child together.

David and Courtney met on the set of “Scream” sometime around 1995 … and were married in 1999. They are currently co-starring in the upcoming “Scream” movie due out next year.

There was a hint of things to come back on September 25 when Arquette was spotted out, sans wedding ring.

UPDATE: The couple has released a statement saying, “We have agreed to a trial separation that dates back for some time. The reason for this separation is to better understand ourselves and the qualities we need in a partner and for our marriage.”

The statement continues, “We remain best friends and responsible parents to our daughter and we still love each other deeply.”

Also On RadioNOW 100.9: