Rod's anguish as son arrested over violent attack on couple

Sean Stewart, 26, has been accused of hospitalising a woman during an assault with a weapon after being refused entry to a party.

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Sean Stewart: Rocker Rod Stewart is upset over his son's arrest for a violent assault on a Hollywood couple

The police inquiry comes as the latest episode in the troubled tearaway's life and is set to heap further anguish on his father.

He previously served a jail term for assault and has battled drink and drugs problems since his teens.

The model, who is currently appearing in TV reality show Sons of Hollywood, lost his temper when he turned up at the bash in the Hollywood hills near his LA home with two male friends.

Proud father Rod Stewart with four of his seven children, Kimberly near left, son Sean, and partner Penny

Stewart was said to have become upset when they were told they were not welcome and he was taunted by revellers leaving the party, then in full swing.

His trio began throwing bricks, rocks, a mailbox and bin at a car parked nearby, smashing the windscreen and sending glass flying.

Then as shocked bystanders looked on, Stewart allegedly yanked open the door and the three men began punching a man and a woman inside.

The woman suffered "massive lacerations to her legs" - allegedly from shards of glass from the broken windscreen - and was taken to Cedars Sinai Hospital, according to US reports.

Police - who refused to confirm the identity of the three men involved in the 3am attack - said a parking warden called officers after witnessing the incident.

A spokesman from the Los Angeles police department added: "The transport officer had been called to the road because of the number of illegally parked cars and was issuing tickets when the incident happened.

"A couple were leaving the address in a Ford pick-up truck when the three suspects threw objects at the vehicle, including bricks, stones and a mailbox.

"The objects smashed the windscreen and the three men continued to throw objects which landed inside the car. The female occupant received cuts from broken glass.

"At one point the three suspects tried to pull the occupants out of their car and were punching them."

Witnesses told entertainment website tmz.com that Stewart became angry at "mocking comments from people leaving the party, laughing at him for being stuck outside."

Stewart's questioning by police will come as a setback for his 62-year-old father, who thought his son was getting his life in order after his problematic teen years.

Sean has admitted that living in the shadow of his father's fame and £100 million fortune contributed to his angst.

He was already experimenting with drink and drugs by the age of 14, was expelled from school at 16 and enrolled with Alcoholics Anonymous at 19.

Five years ago he was jailed for three months for beating a man unconscious outside a restaurant.

His father and model sister Kimberley, 27, were there to support him at the sentencing in Malibu in September 2002.

Rod Stewart has admitted: "It is hard for me to moralise because I take drugs. All you can do is let your children know the dangers.

"I still take drugs socially. My children have been surrounded by huge parties and drinking all their lives. I just hope they see the pitfalls and learn from it."