Charlie Sheen is back to work shooting a scene at Hipster Kids in Westlake Village. In between scenes, Charlie couldn't keep his lips off his new girlfriend. Talk about PDA!

When asked his girlfriend's name, the troubled actor replied, "None of your f-ing business."

The Two and a Half Men star showed up at the location at around 10am and filmed for about four hours. Our photographer says, "Charlie seemed rested and happy to be back at work. He posed for us with his girlfriend; he was kind of showing her off."

During a recent interview with The Dan Patrick Show, Sheen was happy to announce a new woman in his life and although she remained unidentified, he revealed he's "100 percent" in love. Sheen reoprtedly spent the holidays with 24-year-old porn star Bree Olson but it looks like he's got another girl on his arm (er, lips) now!

It's unclear whether today's shoot was for Two And a Half Men, Charlie's hit CBS show. It was a relatively small crew -- approximately 15 - 20 people including hair and makeup. Sheen arrived around 10 am and worked for about four hours. He just left an hour ago, with his young, blonde companion in the car, en route to his home.

There have been conflicting reports over when Charlie might return to work. The actor's own attorney, Yale Galenter, told X17 on February 7th, Sheen would be back on the Two and a Half Men set today. Meanwhile, other reports said CBS had ordered extra episodes of Mike & Molly to replace Two And a Half Men through next Monday.