From Wikipedia, the free encyclopedia. Tiffany Dawn Thornton (born February 14, 1986 in College Station, Texas, U.S.) is an American actress, comedian and singer, best known for her co-starring role as Tawni Hart on the Disney Channel Original Series, Sonny with a Chance Description above from the Wikipedia article Tiffany Thornton, licensed under CC-BY-SA, full list of contributors on Wikipedia