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Swift took the stage that evening to perform her hit "You Belong With Me," dressed in one of her trademark gowns. A wind machine on stage must have been ill-placed, because the singer stepped in front of it--and it blew her dress's swishy skirt right up, fully exposing her rear end!

Luckily, Swift was prepared for such a "wardrobe malfunction"--she was wearing nude-colored briefs, which offered complete coverage and kept the mishap decidedly G-rated.

Most admirably, Swift kept her cool during the little blowup. Most girls would have reflexively grabbed at the skirt--but, ever the professional, Swift merely scuttled a bit and continued on with her performance. In fact, fans watching her from the front probably had no idea any funny business had gone on. Watch for yourselves:

Love her or hate her--you must admit, the gal's a true pro!

Swift is currently in the North American leg of her largely sold-outSpeak Now world tour. You can check dates here. She's also just released a new video from Speak Now, "Sparks Fly," which features scenes from the tour (including a big selection of floaty dresses--although they all stay down in this case).