Michelle Obama has stirred up a White House style war over her right to bare arms.The fashionistas have got their knives out for the First Lady after she showed off her toned triceps and biceps in her first official photograph.With Washington shivering in a snowstorm yesterday, critics blasted the sleeveless look as too informal and out of season.

Up in arms: The claws have come out for Michelle Obama who went sleeveless in her official First Lady portrait taken in the Blue Room of t