It’s freezing in Washington, D.C., in February.

But despite the chill, First Lady Michelle Obama is still exercising her  constitutional fashion right to bare arms.

The first lady is bRage_obama2_2ecoming known for her casual sleeveless styles and impressive muscular arms, which we’ve glimpsed along the campaign trail and even on the cover of Vogue.

And she was bare-armed again last night when President Obama was addressing Congress for the first time.

"Oh my God," Cindi Leive, Glamour editor, e-mailed the New York Times last night. "The First Lady has bare arms in Congress, in February, at night!"

You can see Michelle Obama in the above video, wearing a slim, black V-neck sleeveless dress.

Obama’s super-sculpted arms are reportedly well-earned. She started working out with a personal trainer a few years ago. Madonnamuscles

In recent years, she’s kept up her exercise regimen a few times a week — cardio and lifting weights, or doing Saturday training sessions with the same trainer who kept her husband in shape on the campaign trail.

Now her strong arms getting international attention as they slowly come to symbolize the inner strength of Americans, particularly American women.

Either that or Michelle is just a big fat Madonna copy cat.

What do you think of Michelle Obama’s bare arms?

Is it proper or disrespectful?

Is it admirable or shameless?

Related Michelle Obama news:

Michelle Obama finally gets it right!

Michelle Obama picks Taiwan-born Jason Wu’s gown for inaugural balls

First Lady Michelle Obama picks green dress by Cuban-born designer Isabel Toledo

Michelle Obama’s politics of fashion

Michelle Obama’s Maria Pinto dress draws raves

Michelle Obama’s cheapo Donna Rico dress worn on "The View" flies out of stores

Photos:  Vogue, top; WireImage.