From Wikipedia, the free encyclopedia. Karissa Tynes is an American actress, best known for playing "Krista Cook" in the Disney Channel movie 16 Wishes. She has been in numerous films and television shows. is an American actress, best known for playing "Krista Cooks" in the Disney Channel movie 16 Wishes. She has been in numerous films and television shows. Description above from the Wikipedia article Karissa Tynes, licensed under CC-BY-SA, full list of contributors on Wikipedia.​