Hilary Duff has the Internet buzzing with news of her upcoming comeback album, but on the 2014 iHeart Radio Music Festival red carpet, she gave people a whole other reason to talk!

The former Disney star showed up in a skintight black leather dress with silver detailing. While Hilary wowed us with her glowing complexion and loose, perfectly curled waves, we admit we were a bit surprised by the peek-a-boo underboob she flaunted.

The look keeps in line with the current cutout trend and harkens a likeness to the phenomena New York Magazine fondly refers to as the "cleavage rhombus." (Underboob rhombus? Peek-a-boob? We're still workshopping titles.) Nevertheless, it was one of our favorite Hilary looks as of late.

Check out Hilary's complete outfit in the photos below!

She's working it! This dress is perfection and Hilary's keeping with the edgy vibe by rocking black heels and dark nails.

Bryan Steffy, Getty Images

And a closer look at her flawless locks, gorgeous makeup and THAT cutout.

Bryan Steffy, Getty Images

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