Jen Aniston and John Mayer went to their first public event together Thursday night.

They joined Courteney Cox and David Arquette — who celebrated their nine-year anniversary that night — at a humanitarian event at L.A. steakhouse STK.

A witness said that Aniston and Mayer “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 bash was in honor of Jeffrey Sachs — who is known for his charity work with Angelina Jolie and is pals with Aniston’s ex Brad Pitt. (It was hosted by Mary Fanaro, founder of humanitarian organization OmniPeace, and sponsored by Kitson.)

Aniston and Mayer have been heating up ever since news broke of their relationship in April.

Mayer recently joined Aniston at one of Cox’s weekly BBQs at her Malibu home.

Of his romance with Aniston, 39, Mayer, 30, 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.”

She also recently brought Mayer to a Marley & Me cast party in Miami, where they held hands and kissed.

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PS: I totally had a sex dream about John Mayer last night.  It’s all DListed’s fault.  Did you read this article?  Ever since I read it, I can’t get it out of my head…John and I totally got a little up close and personal in my dream last night.  Let’s just say “Your Body is a Wonderland” was the soundtrack of my dream. 

Pictured: David Arquette, Kristen Davis, Fergie, Tobey Maguire, Dustin Hoffman, Sylvester Stallone, Joey McIntyre and Donnie Wahlberg.

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Love them!

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Courteney Cox has confirmed she’s planning to become a mum again after going public with her baby plans. The 43-year-old actress endured a series of failed pregnancies before she gave birth to daughter Coco in 2004, and she insists her family isn’t quite complete yet.

During a recent appearance on pal Ellen DeGeneres’ daily talk show, Courteney revealed, ‘I do wanna have another one [child]… I don’t know how to achieve that at my age but I would like to have one more’.

Her husband, David Arquette, recently revealed the couple was considering adoption. ‘We would adopt in a second,’ he said.

“We would adopt in a second. I know people who have adopted. I see no difference.”

David Arquette confirms that he and wife Courteney Cox are considering adoption.

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Let there be light! David & Courteney Cox Arquette got into the spirit of the season during a visit Tuesday to Sleeping Beauty’s Winter Castle at Disneyland in Anaheim, CA.

Is anyone as anxious as I am for “Dirt” to get back on the air … ?! Also, has anyone else heard the rumblings of a possible “Friends” movie (supposedly it’s based on whether or not the SATC movie is a success, but let’s be honest- we KNOW it is!)