Jingle Ball 2014 Had Taylor Swift, Ariana Grande, Iggy Azaela And More Keeping Up The Stomach-Baring Trend Through The Polar Vortex

Neither Hell, nor high water, nor Mid-Atlantic winter weather can vanquish the spirited upper-stomach trend. Last night at the New York performance of Jingle Ball 2014, Taylor Swift, Ariana Grande, Iggy Azalea & Charli XCX all wore outfits that bared a bit of upper abdominal. After all, who doesn't love a high-waist bottom to crop-top outfit ratio?

At the Madison Square Garden show on Friday, Azalea gave us a front row ticket to the upper midriff show in a hunter green bra top layered under a black mesh shirt. She tucked into a pair of high-waisted pants. Iggy's musical sister from another mister Charli XCX coordinated with Azalea for their performance of Fancy. The "Boom, Clap" singer wore a hunter green lurex crop top with a high-waisted pleated skirt, with her upper abs just peeking out to say HAY!

Keeping up the trend of northern belly exposure, Ariana Grande sported some white frilly briefs and a bra top during her performance with Jessie J. Taylor Swift wore a plaid 2-piece set consisting of a bustier top and a pair of fitted high-waisted pants. It was a trendy trend-suit fit for the birthday girl, as she turned 25 at the stroke of midnight. Mazel Tov to her and her coy belly button!

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On stage, Iggy's abs gave a virtuoso performance.

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Here's Charli's club kid-midriff, adorable as always, stopping by for a chat with her gal pal.

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Ariana Grande showed off her ribcage region in a fashion girdle and a lace-trimmed bra top. What is she for SantaCon? She's a sexy reindeer. Duh.

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Swiftie's midriff purged all of its feelings by letting out an intensely satisfying primal scream.

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Even in the press room, the stomach party continued with Azalea, Swift, and Charli XCX's outfits. It's just nice to give that area some air, ya know?

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Swift demonstrated that even one-piece garments can let your belly breathe.

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Charlie took it a step further, proving that you don't even need a cutout to get in on the tummy trend. You can just wear a sheer neglige with some clever pom-pons over your lady parts. PS, love that she got into her glam jammies right after a grueling day at the office. A gal after my own heart, this one.

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