Lindsay Lohan was seen ''groping and grinding'' model Adam Senn at a nightclub in Los Angeles.
Lindsay Lohan reportedly rowed with a fellow clubber over a man.
The 23-year-old actress was furious when model Adam Senn - who she was first romantically linked to in December 2009 - spent too long talking to the mystery woman at Los Angeles nightclub Voyeur but after a confrontation, she eventually left the nightspot with the hunk.
A source told X17 Online: "There was some bickering going on because Adam was there with some other chick but soon Adam ditched her to spend the night with Lindsay.
"And later on, Lindsay was shouting at the girl, acting so jealous for some reason. Lindsay kept groping and grinding against Adam before they left together."
Adam is not the only person Lindsay - whose most recent relationship was with Dj Samantha Ronson - has been romantically linked with in recent weeks.
She reportedly spent a lot of her time on her recent trip to London with 'Eragon' actor Edward Speleers, with the blond hunk even introducing her to pals as his girlfriend.
A source said: "Edward took Lindsay to a house party and introduced her to all his friends as his girlfriend.
"He told them she's trying to make it as an actress over here because her acting career has stalled in America.
"She has become close with some of Ed's friends and they all get along well."
The 'Mean Girls' star was also said to have become "obsessed" with model Sam Webb during her London trip after they bonded over their shared interest in fashion.