Lindsay Lohan’s romance with Samantha Ronson is reportedly on the rocks again after a violent argument between the two resulted in a smashed window at their Los Angeles home over the weekend.

The incident occurred on Saturday morning after Lindsay, who is wanted by police on DUI charges, spent Friday night partying with pals at hotel Chateau Marmont in Los Angeles.

Samantha arrived home a few hours later and the pair began to argue so loudly neighbors had to call the police. Shortly thereafer, a side window of the house was smashed, sending glass flying across a path.

“The police were called in by a neighbour after a loud argument between Lindsay and Sam, which could be heard out on the street,” a source tells WENN. “At one point, something went flying through a side window, shattering glass on the side walkway of the house. LAPD officers pounded at the front door but Lindsay or Sam did not open the door.”