Hairstyle File: Michelle Obama's Bob

It goes without saying that Michelle Obama is a fashion icon (who else but our First Lady could make a cardigan so irresistibly chic?).

She keeps her hair stylish by being consistent with a classic coif: the versatile bob.

From her State Dinner upsweep to her sleek 'do in South Africa, here are Mrs. Obama's loveliest mane moments over the past year.