Premise: Katelyn Tarver (born November 2, 1989) is an American actress and singer. She is known for her recurring roles as Jo Taylor on the Nickelodeon series "Big Time Rush", Natalie on the ABC series "No Ordinary Family", and Mercedes on ABC Family "The Secret Life of the American Teenager".
Hypothesis: Katelyn Tarver worked on "Big Time Rush" for a longer time than "No Ordinary Family" and "The Secret Life of the American Teenager".