The EXACT Control-Top Underwear Katy Perry Wore Underneath THAT Green Grammys Dress

(Getty Images) Katy Perry wowed the audience in her skintight mint green Grammys dress

Katy Perry's mint green Gucci gown was a total showstopper on the red carpet at the 2013 Grammy Awards this weekend. The skintight, cleavage-baring long sleeve dress managed to leave nothing—and, simultaneously, many things—to the imagination. It definitely captivated the attention of talk show host Ellen Degeneres, who couldn't help but gawp at Perry's gravity-defying cleavage:

(Getty Images) Porta de Rossi, Ellen Degeneres, Katy Perry at the Grammys

The question at the forefront of our minds all night, though, was: What kind of control-top underwear was Katy Perry wearing!? Without the right undergarments, the unforgiving material of the dress—in such a light color—would have been a lot less flattering. But Perry looked drop-dead gorgeous.

Well, today, I popped by the Spanx suite at fashion week and my good friends there let me in on Perry's little secret.

At the 2013 Grammy Awards, Katy Perry wore Spanx's "Undie-tectable High-Waisted Mid-Thigh" longline underwear—a $58 pair of panties that reaches from just under the bust to mid-thigh. They're made of hosiery yarns—which means it's really light and totally not bulky—and features medium control at the tummy, the butt (preventing uni-butt!), and all around.

Check 'em out right here:

Not a bump or lump in sight! Amazing!

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