04/07/2014 09:39 EDT | Updated 04/07/2014 09:59 EDT

Taylor Swift's 2014 ACM Awards Look Is Surprisingly Mature (PHOTOS)

We knew Tay was trouble when she walked in!

After years of favouring sparkly ballgowns and, um, sparkly ballgowns, Taylor Swift sported a mature and sexy look at the 2014 ACM Awards on Sunday in Las Vegas.

Rocking a J. Mendel black-and-white ensemble, the 24-year-old's look included a crop-top with short sleeves and cutouts and a floor sweeping skirt with a thigh-high slit.

Looking as if she were the cat that just ate the canary, the "I Knew You Were Trouble" singer posed like the red carpet pro she is and rocked a short, wavy hairdo, a red-orange lip and smoky blue eyes.

And Tay wasn't the only celeb to sport a revealing outfit at the ceremony: "The Newsroom" star Olivia Munn sported a dusty rose frock with a bold slit and a low-v neckline.

We're loving Taylor's grown-up look!

More red carpet looks from the ACM Awards:

Photo gallery 2014 ACM Awards Red Carpet See Gallery