Lindsay Lohan and lover Samantha Ronson had a physical fight during a night out in London.

Ronson flew into a jealous rage when she spotted girlfriend Lohan flirting and dancing erotically with her ex-boyfriend, British model Calum Best, at exclusive nightclub Boujis on Tuesday, and stormed over to confront the pair.

A source said: "Sam had had a few cocktails earlier in the evening and was perhaps a little more emotional than usual.

"While she was in the VIP section, Calum went up to Lindsay on the dancefloor. Lindsay was lapping up the attention, having a laugh — and a flirt. But Sam saw them and went ballistic.

"She marched over and started pushing the pair, demanding to know what they were doing.”

Lohan and Ronson began screaming and swearing at each other, with the argument becoming so heated Best eventually had to pull them apart.

The source said: "They caused quite a commotion — everyone was staring. Then it erupted into a catfight, with Sam and Lindsay swearing and screaming like banshees.

"Calum looked mortified then things got nasty and he stepped in to separate them."

Ronson (31) was said to be particularly upset as it was the second time in a week Lohan had seen 27-year-old Best. He tried to approach her at London’s Chinawhite nightclub last week, but Lohan (22) avoided him.

Although Lohan and Ronson left Boujis together, Ronson was seen storming into the pair's Kensington hotel room, leaving Lohan alone in their car for 10 minutes.

Lohan eventually followed her lover inside, but emerged an hour later and collapsed on the street in a flood of tears.

A source said: "Lindsay couldn’t take any more fighting in their room, so she was driven on to the street. But Lindsay returned to the room later that night and things calmed down."