Lindsay Lohan has reportedly walked out on Samantha Ronson.

The "Mean Girls" actress was spotted leaving the Los Angeles home she shares with the DJ carrying a large bag shortly after the pair had a vicious public argument.

The row started on December 31 at Miami's SET nightclub, where the pair exchanged foul-mouthed tirades in front of shocked partygoers.

It continued as the pair moved on to Mansion club, where Lindsay eventually stormed out - with the fight continuing in an alley behind the club.

Lindsay, 22, reportedly shouted at Samantha: "When I storm off, you are supposed to follow me!"

The fight then moved to the couple's hotel - where things became so heated the pair exchanged blows in a corridor until security intervened.

An onlooker said: "The screams and crashing from their room were heard all over the hotel. They spilled out into the hallway at 11am on New Years day, kicking and punching each other.

"People were watching. They were going for it - it was scary. Lindsay seemed unstable. At one point she dropped to her knees and cried, 'Why are you doing this to me?' Sam just said, 'I don't know you.' "

The couple are also said to have destroyed their hotel room during the fight, with security guards reportedly taking photographs of the damage.

Lindsay was still visibly upset at the airport as she and Samantha, 31, prepared to return to Los Angeles.

Another source said: "Lindsay was so inconsolable the flight attendants asked if she'd like to disembark."

A spokesperson for Lindsay denied the couple had split, saying: "There was an argument - I don't know the details - but they left for Los Angeles together and it's fine."

(China Daily/Agencies January 7, 2009)