Katelyn Tarver (born November 2, 1989) is an American actress and singer-songwriter. She has independently released four EP's since 2011, most notably Tired Eyes in 2017. She is also known for her recurring roles as Jo Taylor on the Nickelodeon series Big Time Rush, Natalie on the ABC series No Ordinary Family, Jesse in HBO series Ballers and Mercedes on ABC Family The Secret Life of the American Teenager. She co-wrote "Crazy Stupid Love" for the British singer Cheryl which peaked at #1 on UK Singles Chart in 2014.