Kat Graham Goes Blonde With New Hair Color. Many celebs are going blonde these days, and Kat from the Hit Tv Show “Vampire Diaries” is the latest to join the trend. She debuted her new look 102.7 KIIS FM’s Wango Tango at The Home Depot Center Carson, California. Along with her bold new color, the star also wore a tight curly ponytail, which really put emphasis on her new blonde hue. She finished her look off with a red form fitting dress, and black combat boots.