The latest pictures of Demi Moore are likely to cause concern among her family and friends, as she was seen exhibiting some very bizarre behavior at a Chanel party with Lenny Kravitz on Wednesday night.

Demi Moore, 50, played up to the photographers present at the Chanel Beachside Barbecue, leaving friends including Lenny Kravitz and George Clooney’s girlfriend Stacy Keibler bemused by her antics.

As she enjoyed a chilled out sit down with Lenny Kravitz, Demi Moore couldn’t resist busting some moves in time with the music.

The mother-of-three, who wore a chic grey playsuit for the occasion, was seen lifting her arms and bumping and grinding while in her seat, as Lenny Kravitz appeared embarrassed and looked away.

While it is not clear whether or not Demi Moore was drinking at the evening, an array of energy drink cans were seen in front of her on the table – perhaps giving some explanation to her behavior.

As well as her dancing, Demi Moore was seen playing around with her hair – pulling her raven locks in front of her face as she posed up with Lenny Kravitz.

Later in the evening, Demi Moore found a new friend to play with as she posed with Stacy Keibler, who did her best to give the waiting photographers a chic shot – despite a slightly manic-looking Demi clinging on her arm.

Demi Moore was seen exhibiting some very bizarre behavior at a Chanel party with Lenny Kravitz on Wednesday night

While Demi Moore’s new beau American art dealer Vito Schnabel was at the event, the pair didn’t pose up together, but were rumored to have indulged in a passionate PDA inside.

A source told E! News: “They are definitely a couple. She is definitely more down to party than Vito.”

And the source added of Demi Moore’s partygoer attitude: “She was most ready to party than anyone else in the room!”

Other stars to attend the Chanel event included model Karlie Kloss and Rupert Murdoch’s wife Wendi, as well as Roman Abramovich’s girlfriend Dasha Zhukova.

Demi Moore has been keeping something of a low profile since announcing her marriage to Ashton Kutcher was over in November 2011, and is rarely seen at red carpet events.

As well as dealing with her marriage breakdown, the actress has also been struggling with health issues and checked into rehab last January.

But following her recovery, Demi Moore has thrown herself into her acting career and has landed a part in the highly anticipated drama Very Good Girls, which also stars Elizabeth Olsen and Dakota Fanning.