Jennifer Lopez stole the spotlight last night on American Idol, when she showed off a sexy iridescent dress in a shimmering shade of turquoise. The mermaid-esque Fyodor Golan sleeveless gown featured an asymmetrical hem and an abundance of shimmering sequins. She paired it with a pair of gold Casadei pumps.

But it wasn’t only her dress that turned heads: Her makeup tied the look together. “We really wanted to do something soft and fresh, because tonight’s look was about the dress,” said makeup artist Mary Phillips. “I used soft taupe grays to do a light smoky eye, and a light silvery pewter glitter in the center and corner of the eyes. I used a rose gold glitter under the brow bone. Then to brighten up her skin, I used a soft pink-peach blush with a golden glow. And I finished the look with a simple, peachy-pink lip.”

Want more J. Lo fashion? Visit InStyle.com every Thursday and Friday this season to catch more of Jennifer Lopez’s American Idol style moments, and see all of her head-to-toe looks from Idol by clicking through our gallery!