Jen Aniston and John Mayer helped Courteney Cox and David Arquette celebrate their nine year anniversary last night.

The two couples attended a humanitarian event in honor of Jeffrey Sachs (who is known for his charity work with Ms. Jolie) at a steakhouse in Los Angeles.

A witness says that Jen and John, “had their arms around each other. She was rubbing his back and whispering into his ear. They were touching each other non-stop all night.”

The couple have been spotted together numerous times over the past couple of months. John attended the cast party of Aniston’s new film, Marley & Me, in Miami and more recently they enjoyed time together at the home of Cox and Arquette.

Of the relationship with Aniston, Mayer has said, “This is not a scandal, this is not an issue, this is not a problem, this needs no spin control. This is me living my life.”