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According to The Mirror, the Welsh actor put a man "in a headlock" for chatting to his new lover at the Bungalow 8 bar.
He apparently shouted: "F*** off - don't touch my bird! Let's take this outside, you think you're a big man."
The pair allegedly tussled and knocked a table of glasses to the ground.
Stewart stopped the fight, telling Ifans: "I've had enough of this s**t. Rhys, don't do this. It's my birthday, stop it."
She then reportedly grabbed his face and told him to "f***ing calm down".
> Ifans: 'Sienna doesn't deserve a song'
