Makeup artist: Julie Harris

Celebrity clientele: Allison Williams, Elisabeth Moss

"I really love the new Physicians Formula Eye Booster 2-in-1 Lash Boosting Ergonomic Felt-Tip Eyeliner + Serum, $11.95," says Julie Harris. "It goes on easily, doesn't flake, and stays on extremely well." Plus, she adds, the felt tip format makes it easy to control the thickness of the line for those who have a hard time achieving the perfect cat eye.

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