Lindsay Lohan’s relationship with ex-girlfriendSamantha Ronson has turned violent, a source close to both of them told RadarOnline.com exclusively.

Although Lindsay appeared to have moved on from her tumultuous relationship with girlfriend Ronson, the two have been spotted out at the same clubs recently and as RadarOnline.com exclusively reported they fought so badly one night that Lindsay threw a drink in Sam’s face.

“One time I saw her [Lindsay] and she had a large welt on her head,” the source told RadarOnline.com. “She told me that Sam beat the (bleep) out of her.

“She also said that Sam even punched and choked her one time.”

Making things worse is the fact that both women live in the same building.

Following the break-in at her Hollywood Hills home, Lindsay moved into an apartment in West Hollywood. Shortly after, Samantha moved in. The source tells RadarOnline.com that Ronson regularly comes over using a key she has to Lindsay’s apartment.

“It’s so twisted. They’re not together, but they are,” said the source. “I never thought I’d ever say this, but I really do feel sorry for Lindsay. She is just lost. She’s alone. She has no friends to turn to.”

Lindsay’s father Michael Lohan has repeatedly expressed concern that Lindsay’s behavior is being negatively effected by the prescription drugs she’s taking and that she is taking too many.

Source: RadarOnline