Kat Graham has announced that she will be leaving beloved CW show 'The Vampire Diaries' after the program's eighth season. The 26-year-old actress has played Bonnie Bennett since the pilot episode of the show premiered in 2009. Graham tells Us Weekly, "Season 8 will be my last season. I just hope that whatever I do after, the crew can come with me. The crew is going to be the hardest thing to let go, because we are a family.? Vampire Diaries is currently airing its seventh season.