She became known to television audiences for her Teen Choice Award-winning role as Elena Gilbert/Katherine Pierce on The Vampire Diaries. Her film credits include The Perks of Being a Wallflower and The Roommate.
While growing up, she spent time training in ballet and jazz dance while competing in rhythmic gymnastics.
She played Mia Jones on Degrassi: The Next Generation and Degrassi Goes Hollywood.
She has one older brother named Alexander and was raised by her artist mother and her tech-savvy father. She was in relationships with Glen Powell, Austin Stowell and her Vampire Diaries co-star Ian Somerhalder.
She and Drake both began their careers on the Canadian show Degrassi: The Next Generation.