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Gisele Bundchen

Under Armour signs Gisele Bundchen

Under Armour, in the midst of its biggest-ever campaign targeting women, has signed supermodel Gisele Bundchen, the Baltimore-based sports brand revealed today in a 30-second teaser video on YouTube.

"Under Armour announces the signing of Gisele Bündchen, international fashion icon and athletic female, as the latest addition to the I WILL WHAT I WANT campaign," the company said in an emailed statement after posting the video. "Coming September 4."

A company spokeswoman offered no additional details.

Under Armour kicked off its nearly $15 million women's campaign earlier this summer with ads featuring American Ballet Theatre...