HARRY Potter star Michael Gambon keeps his chin up during a downpour yesterday — by shielding his monster beard in a special sack.

The new Dumbledore showed his wizard wheeze for keeping his whiskers dry while filming at Glencoe.

Sir Michael, 62, stepped into the role after the death of Sir Richard Harris, 72.

The 350 film crew have been battling bad weather as they shoot The Prisoner of Azkaban.

Things clearly get hairy in the Scottish Highlands at this time of year.