We love watching actress Sophia Bush on the hit NBC show 'Chicago P.D.' and let's be honest, we also loved watching her on 'One Tree Hill' -- yes, we said it! Sophia is a staple on the red carpet and her style has really transformed over the years.

We sat down with Sophia to find out more about life in the spotlight. Whether she's filming in Chicago and battling cold winter temperatures or at home in L.A. there's a few key beauty buys Sophia can't live without! For Sophia, Chapstick is her lip moisturizer of choice. She choose to leave her lipgloss behind but never leaves the house without mascara.

Click on the video above to find out Sophia's beauty splurge, steal, and what item of clothing she'd never leave behind.

Tune into 'Chicago P.D.' Wednesday's nights 10/9c on NBC.