Lovers Lindsay Lohan and Samantha Ronson stunned revellers at trendy London nightspot Boujis during a heated row about the actress' ex-boyfriend, model Calum Best.

British tabloid The Sun reports punches were thrown during the brief brawl, which was sparked when DJ Ronson spotted her girlfriend dancing with Best.

One witness tells the publication that the two girlfriends had to be separated by Best.

The reveller tells The Sun, ?Lindsay was having a boogie on the dancefloor with Calum... and then all hell broke loose. Sam came screeching up to Lindsay, screaming blue murder and throwing punches. She went ballistic.

?The pair traded a series of blows before Calum managed to prise them apart. It was a really ugly scene.?

Lohan and Ronson continued fighting as they left the venue minutes later, according to the report.

The witness says, "She (Lohan) was fuming.?

Lohan is in Europe supporting her girlfriend on a whirlwind DJ tour of clubs.