The 23-year-old actress, who has been in an on/off relationship with DJ Samantha Ronson since 2008, met Petey Wright during a photo shoot at Hollywood's Chateau Marmont hotel recently.
Sources on the set claim the pair couldn't keep their hands off each other during the shoot, running to her nearby hotel room as soon as the photographer said he was finished.
An insider told X17Online: "Lindsay was all over Petey during the sexy photo shoot, and it continued when the shoot ended. They headed into a room at the Chateau for two hours and Lindsay couldn't keep her hands off of him - and vice versa!"
Lindsay and Petey finally emerged from the hotel at 1.30 am and drove to nearby Wonderland club, where they spent just under two hours kissing and cuddling in a corner.
A staff member said: "Oh my god! I was at Wonderland club tonight and Lindsay was there with some hot model guy named Petey."
"She posted a picture of him on her Twitter! She had her hand on his leg the whole time between kisses, and they stayed for two hours. I can't believe it!"
Lindsay, who left the club alone, later posted a photo of Petey on her Twitter account, with a message about how much she enjoyed working with him.