30. The Lash Enhancer — No holiday party look is complete without a hit of lash-enhancing mascara. Formulas that thicken and lengthen without clumping will help give definition and frame your eyes.

Guerlain Maxi Lash, $30, available at Sephora; CoverGirl LashBlast Clump Crusher, $6.99, available at Soap.com.