Lindsay Lohan and Samantha Ronson fighting again

Lindsay Lohan and Samantha Ronson have been at it again. Mere hours after angering management types at the Seminole Hard Rock Hotel & Casino on Saturday night for not talking to media, the passionate duo had another blowout, this time at Las Vegas nightclub Prive.

According to widespread reports, Lohan popped up to surprise her DJ gal pal during her Monday night gig. But around 3 a.m., an angry-looking Ronson was spotted as she stormed out of the club and sped off in her Porsche, sans Lohan.

When are these two going to call it quits already?