Actress and singer whose major film debut was in the 2000 film How the Grinch Stole Christmas. She is also well known for her role as Jenny Humphrey on Gossip Girl. She also became the lead singer and Songwriter of the band The Pretty Reckless in 2009.
She began acting professionally at age three after being cast in a commercial for Shake n' Bake.
She was nominated for a Blockbuster Entertainment Award for Favorite Female Newcomer for her role as Cindy Lou Who in How the Grinch Stole Christmas.
Her parents are Michael and Collette, and her younger sister is named Sloane.
She starred in Gossip Girl with Blake Lively.