Holiday Beauty Do's & Don'ts

Get the lowdown on the must-have looks of the festive season, as selected by PEOPLE's beauty editor Eleni Gage. By Serena Kappes

TREND: JEWELED BARRETTES

DO: Be sure to place the sparklers (worn by Mariska Hargitay and Penelope Cruz) asymmetrically for a "sophisticated and modern" look, says Gage. For a fun substitute, use a brooch – a bobby pin can hold it in place.

DON'T: Overdo your accessories. You don't want to distract from the barrettes, she says.