Katerina Alexandre Hartford "Kat" Graham is a Swiss-born American actress, model, singer, and dancer. She was born in Geneva, Switzerland and raised in Los Angeles, California.
In 2002, Graham made her television debut on the Disney Channel television series Lizzie McGuire. Graham went on to appear on various television shows, including CSI: Crime Scene Investigation, The OC, Malcolm In The Middle, Joan of Arcadia, Grounded For Life, and Greek. In 2008 appeared in three episodes of the Disney Channel television series Hannah Montana playing the role of a girlfriend to the character Jackson Stewart. Graham has also had notable supporting roles in films such as 17 Again and The Roommate.
In December 2008 Graham began filming sci-fi dance film Boogie Town in Los Angeles, California. Filming on the film was put on hold that same month due to payroll issues with background performers. In April 2009 principal photography was stopped due to schedule conflicts with some of her cast mates and other projects. The film is set in a futuristic New York City in 2015 where dance battles are permanently banned. Graham plays the role of Ingrid. The film was set to be released in theaters worldwide October 2011, however it was set to be originally released in June 2009.
In March 2009, Graham was cast in The CW supernatural drama television series The Vampire Diaries based on the book series of the same name. Graham portrays the role of Bonnie Bennett a teenage witch and is considered her breakout role. The series premiered on September 10, 2009 to 4.91 million viewers and received praise for the series progression from critics.