Michelle is all the rage.

The First Lady glows in red on the cover of Glamour’s December Women of the Year issue. While we’ve seen Mrs. Obama on the covers of Oprah, Vogue, Essence, Ebony, The New York Times magazine – just last week — and many more, this is the first time Glamour magazine, now 70 years old, has ever featured a First Lady. The Glamour editors note, of course, that Mrs. Obama has become a role model for young women, which was one of the reasons why they selected her as their cover girl.

"We love that she’s particularly set on expanding young women’s horizons," the staff writes on Glamour.com. "The First Lady is establishing mentor relationships between top women in the administration and girls in need in D.C., and is encouraging women leaders around the country to do the same where they live. Love that."

We love that, too. Few have graced the Oval Office with such style and substance…

She has mastered the delicate balance of wife, mother and advocate for important issues dear to her heart (including childhood obesity and military families). Oh, and one more thing: This Harvard Law School graduate is a true fashionista.

More of Mrs. O:

Michelle Obama: The First Lady in Photographs

The ‘Strategic Sensibility’ Behind Michelle Obama’s Style: A Conversation With Mandi Norwood

Michelle Obama: 100 Days of Style and Substance