Spanx are a godsend for women when getting dressed up. The undergarments are designed to slim the shape and hold in any of those pesky "more of you to love" parts that most women have. Most celebs won't be caught dead on a red carpet without a pair of Spanx, even when they are trim and toned. Katy Perry recently braved the red carpet at the UNICEF ball in NYC on Nov. 27 sans Spanx. Turns out the curvy singer with the to-die-for body was not a happy camper leaving the bodyshapers at home.

"I feel like my [fat] is sticking out so bad right now," she told Us Weekly. "I almost always wear [Spanx], but not tonight, and I feel it pushing out, making me look fat."

Uh, Katy, you looked anything but fat in your blue, caped Naeem Khan gown at the ball!

The Billboard Woman of the Year cover girl also revealed that she does stay in shape by running on the elliptical while watching CNN, but she doesn’t do it enough. Lord knows working out is boring, so keeping up with world and political events while you're exercising is a good strategy. For a girl who slacks on working out, Perry sure is in shape.

Watch the Katy Perry 'Wide Awake' Video