Samantha Ronson is reportedly being urged to ditch girlfriend Lindsay Lohan by her brother, Mark.

The couple have not been pictured together following a series of public bust-ups over the holiday period, prompting rumours that they have called time on their fiery relationship.

And a split would apparently be welcomed by Sam's older brother, super-producer Mark Ronson.

A source tells the News of The World, "Mark doesn't think Lindsay is right for his little sister.

"He's really protective and is pressing to end it for good."

Last week Lindsay took to her blog to hit back at the break-up gossip.