Lindsay Lohan: 'Samantha Ronson is Not Single'

Could Lindsay Lohan and Samantha Ronson be about to confirm what the world already knows: that they are, in fact, dating?

The gal pals were partying last night at the Shrine nightclub at MGM Foxwoods, and when it was time for DJ Sam to step up to the stage, the 'Mean Girls' star took over the announcing duties and shared a lot more than fans were expecting.

"When the lights came out, she announced Sam and said, 'And no she's not single!'" an eyewitness tells OK! magazine, adding that Ronson couldn't help but let her gooey emotions show in her set either.

Sam -- the sister of super-producer Mark Ronson -- played several smoochy songs, and lingered on Leona Lewis' "Bleeding Love" for much longer than other records.

Earlier that day, the nearly inseparable duo were "holding hands, acting all lovey-dovey around the MGM Grand," the source adds.

Meanwhile, Lindsay is reportedly set to throw a party for her friends and family to thank them for supporting her relationship with Samantha. She has, however, banned her dad, Michael, from attending in case he causes a scene -- because he thinks Lindsay is just going through a "phase".

"Michael thinks Lindsay is just going through another phase and that she will end up getting hurt. He thinks it is embarrassing," a source said.

Lindsay -- who spent time in rehab last year to be treated for alcoholism and drug addiction -- recently spoke about her relationship with Samantha.

The actress said, "I just want to live a happy, healthy year, continue on the path that I've been on and be with the person that I care about, and my family."

Via showbizspy.com