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from www.tmz.com – Playmate Claire Sinclair has obtained an emergency restraining order against Hugh Hefner’s son Marston Hefner — after he allegedly beat her up [Sunday] night during a heated argument.

Claire just left the Pasadena Police Department, where officers interviewed her about the incident — and we’re told police granted a 3-day stay-away order against Marston to give Claire time to move her stuff out of his place.

In the video, Claire says it’s a 5-day restraining order — but law enforcement sources tell us, it’s just 3.

Claire tells TMZ, she plans to move out asap — but if she needs more time … she’ll have to go to court to extend the protective order.

Claire says she called Hugh after the incident who expressed sympathy — claiming he was very disappointed by the situation.

TMZ broke the story … Marston was arrested around 11:15 PM [Sunday] night for misdemeanor domestic violence after police responded to a 911 call from Sinclair’s family — and observed several injuries on the model’s body.

Marston — who has been dating Sinclair on-and-off since August 2010 — admitted the two had gotten into an argument, but didn’t cop to hitting her. He has since been released on $20,000 bail.