Billboard Music Awards: Cat Eyes Are the Red Carpet's Go-To Makeup

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Laverne Cox, Taylor Swift and Hailee Steinfeld at the 2015 Billboard Music Awards

The stars played it safe with the feline-inspired look on Sunday.

There seems to be an unspoken red-carpet rule: When in doubt, turn to the cat eye.

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Such was the case on Sunday at the Billboard Music Awards in Las Vegas, where stars like Orange Is the New Black's Laverne Cox rocked the classic look. Wearing a plunging, glittery Marc Bouwer number, Cox opted for a thick eyeliner, while Pitch Perfect 2's Hailee Steinfeld went with a more modern interpretation of the look that tapered into a fine point.

Read more Where Are the Groomers at the Billboard Music Awards?

But the winner? The perfectly subtle smoky version sported by none other than Taylor Swift, who looked flawless despite a whirlwind weekend, which included the debut of her "Bad Blood" music video and a quick trip to Indiana to watch her younger brother, Austin, graduate from Notre Dame.