Michael Sheen Suffers Arm Injury

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September 3, 2012 | 11:16am EST

Welsh actor Michael Sheen is sporting a sling after suffering a mystery arm injury.
The Frost/Nixon star was photographed walking around Los Angeles over the weekend with his right arm encased in an immobiliser cast and sling.
Sheen was pictured holding hands with his actress girlfriend, Rachel McAdams, who carried the couple’s shopping bags.
It is not yet known how Sheen hurt his arm.