Lindsay Lohan and Samantha Ronson having nasty fistfights?

Lindsay Lohan and Samantha Ronson having nasty fistfights?

Girlfriends Lindsay Lohan and Samantha Ronson are having nasty fistfights , PAGE SIX reports

Trouble started at Set in Miami. "Both their families were there, and Lindsay and Sam just started going at it," a spy said.

Then, on New Year's Eve, the couple started screaming at each other while hosting a party at Mansion.

"When I storm off, you are supposed to follow me!"

The spy said, "It was a really gross alley. There was a bum eating a sandwich watching the whole thing. Lindsay was really unstable and flipping out."

After Lohan and Ronson went back to the hotel, several sources heard crashing sounds and screaming coming from their room until the fight spilled out into the hallways at about 11 a.m.

"They were punching each other - it was bad," a spy said. "And they were doing this in front of all of us. It was scary."

At one point, Lohan dropped to her knees and cried, "Why are you doing this to me?" And Sam just said, "I don't know you."

A rep for Lohan said, "There was an argument - I don't know the details - but they left for LA together and it's fine."