Katherine Amanda Blair (born December 29, 1987) is an American actress, model and beauty queen who won Miss Teen USA 2006 and Miss California USA 2011. She was the first person from Montana to win a major pageant title. In 2011, she was crowned Miss California USA after originally placing 1st runner-up to Alyssa Campanella. When Campanella won Miss USA 2011, Blair was crowned as successor on June 25.
Blair represented Montana in the Miss Teen USA 2006 pageant held in Palm Springs, California on August 15, 2006, and became the first Montanan to place in the pageant. Outgoing titleholder, Allie LaForce of Ohio, crowned Blair as the new Miss Teen USA. Melissa Lingafelt of North Carolina placed first runner-up. Prior to Blair's win in the nationally televised pageant, Montana had been the only state in the competition's 23-year history never to have had a semi-finalist.
Houston designer Gaspar Cruz styled Blair's evening gown, hair and makeup. Previously Cruz designed gowns for Gina Giacinto, Miss Nevada USA 2001, who was top five at Miss USA, and for Shauna Gambill, Miss California USA 1998, who was first runner-up at Miss USA.