Lindsay Lohan abandoned by Samantha Ronson in Vegas

Lindsay Lohan was abandoned by girlfriend Samantha Ronson in Las Vegas.

The 'Mean Girls' actress had planned to surprise her DJ lover with a romantic night in a hotel after she finished her set at Prive nightclub but was enraged when Samantha left the club without her.

She reportedly screamed: "I can't believe that f**king b***h left me!"

After driving from their home in Los Angeles earlier that evening, Samantha had planned to go to the club alone and was believed to be furious when Lindsay showed up at 1am.

A source said: "The two started to argue and hide in the DJ booth. While she was in the booth, Lindsay ducked down, popped up a few seconds later, and began dancing wildly."

Following her set, 31-year-old Samantha left the club at 3am and got into her Porsche. She drove alone as 22-year-old Lindsay looked on from the roadside.

Evidently outraged, Lindsay jumped into her black Mercedes and sped off in the direction of her girlfriend's vehicle.

A photographer said: "I'm sure the girls drove back to Los Angeles. Lindsay definitely appeared to be messed up on something, that's for sure. I've covered Lindsay for years and this is almost the worst I've ever seen her, it looks like her life is spinning out of control."