Sean Friday and Demi Moore in Mexico
01/13/2014 AT 08:00 AM EST
It wasn't just a vacation fling.
Back in L.A. after steaming up Tulum, Mexico
, on a New Year's vacation, Demi Moore
and new beau Sean Friday
put on quite a public display of affection while out clubbing Saturday night.
"They danced and made out all night," an onlooker tells PEOPLE of Moore, 51, and Friday, 27, who partied in the VIP section of the club at The Standard Hotel in Hollywood until 2 a.m. Sunday morning. "Demi was chatty and smiley all night. She looked flawless."
When they weren't dancing, the canoodlers, both dressed in black, hung out with Moore's longtime friend, floral designer Eric Buterbaugh, at a table well-stocked with Moore's signature Red Bull.
Sources have told PEOPLE
that Moore and Friday, the drummer for the L.A. band Dead Sara, have been friendly since at least last summer. Moore, whose divorce from Ashton Kutcher
was recently finalized
, has been spotted at Friday's gigs at The Sayers Club, where her daughter Rumer Willis
, 25, often performs.