The 21-year-old son of high-profile sports broadcaster James Brayshaw is facing drug possession and assault charges following a violent New Year's Eve stoush at a luxury beach house on the Mornington Peninsula.

Henry Brayshaw, son of the ex-Footy Show host turned Channel 7 cricket commentator, was arrested following a party at the Portsea beach house of a prominent Melbourne real estate agent.

Henry Brayshaw, son of former North Melbourne Football Club chairman James Brayshaw. Credit:Social media

Police said officers were called to the property soon after the party ended when a 21-year-old male refused to leave, about 5am on January 1.

The former Geelong Grammar student was later found in possession of magic mushrooms, they said.