Before starring as Sophie, Hilary was gushing over Ethan Craft (Clayton Snyder) and heading to Rome on school trips in Lizzie McGuire back in the early aughts. She is also known for her movie roles in A Cinderella Story, Cheaper by the Dozen, Cadet Kelly, Casper Meets Wendy, Material Girls, The Perfect Man, The Haunting of Sharon Tate, Flock of Dudes and Beauty and the Briefcase.
She also played Kelsey in the Sutton Foster-led series Younger and Olivia Burke in Gossip Girl.