Rhys Ifans ruined his new girlfriend's birthday party on Wednesday night.
The hellraising actor was celebrating Kimberly Stewart turning 29 at London's Bungalow 8 club when he spotted a fellow reveler getting close to his lover.
Rhys grabbed the man, thought to be one of his friends, in a headlock and hurled abuse at him.
He screamed: "F**k off. Don't touch my bird! Let's take this outside, you think you're a big man?"
After security broke up the fight, the "Notting Hill" star - who is also the frontman of Welsh rock outfit The Peth - careered into a table and sent glasses smashing on the floor.
The troubled 40-year-old "Notting Hill" star - who split from actress Sienna Miller earlier this year - was seen with a small mustache drawn on his upper lip and said he was a "big fan of Hitler".
He also simulated sex on a friend who had fallen over on the dance floor.
Rhys was eventually calmed down by Kimberly - the daughter of rocker Rod Stewart - who grabbed him by the face to get his attention.
She told him: "F**king calm down. I've had enough of this s**t, Rhys, don't do this. It's my birthday, stop acting like you're 12."
Kimberly eventually made Rhys leave the club and they were seen getting into a taxi.
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