Troubled actress Lindsay Lohan is single again after splitting from rocker Avi Snow.

The Mean Girls star has ended her brief relationship with the City of the Sun guitarist, just one week after they were photographed kissing during a night out in California.

It is not known when the pair broke up but, according to E! News, Lohan and Snow were still together when he saw her off on her recent trip to Brazil.

Snow gushed about Lohan during their short romance, insisting, "She's really awesome, and she's a lot of fun. I would definitely call her one of our biggest supporters."

Lohan has been given until 2 May (13) to enrol in a rehabilitation facility after pleading no contest to charges relating to a car crash in California last summer (12).