Robertson grew up in South Carolina and truly fell in love with acting at age 12. She started making trips then to Los Angeles to audition for shows and commercials.
She was the main character in the King Arthur-inspired television movie, Avalon High in 2010. She starred as Lux from 2010-2011. She would move on to CW new show, The Secret Circle, which she was the main character. The Secret Circle is based on witchcraft (somewhat similar to WB's [one of the component networks that made the CW] Charmed). It ran only for twenty-two episodes/one season, with many fans pulling for a return.
However, Britt is returning to CW in a somwhat supporting role in the new summer show Under The Dome, which will premiere in June 2013.