Report: Lindsay Lohan and Samantha Ronson Break Up!

Following months of flirting, dating, denying that they were dating, fighting and denying that they were fighting, Lindsay Lohan and Samantha Ronson have finally broken up.

And, "this time, Sam means it," a source told Us Weekly.

The couple got into a fight over the weekend at a party Ronson hosted for her fashion-designer sister, Charlotte Ronson, at West Hollywood's Bar Marmont.

If Samantha Ronson and Lindsay Lohan cannot make it as a couple, what hope is there for anyone?

How did Samantha break the news to her lover that their relationship was over? In the most mature of ways, reportedly.

"[Sam] told security to look out for Lindsay and block her from getting in," said an insider. "Lindsay, of course... booked a room at [the hotel] Chateau and fully intended to crash the party and make a scene."

However, security kept the troubled actress from entering the shindig.

"She was heartbroken, but Sam did not want Lindsay entering and causing a scene and ruining Charlotte's night," said a witness.