Torrey Joël DeVitto (born June 8, 1984) is an American actress, musician and former fashion model. She is best known for her recurring roles as Melissa Hastings in the ABC Family/Freeform mystery/thriller series Pretty Little Liars from 2010 to 2017, Dr. Meredith Fell in The CW fantasy drama The Vampire Diaries from 2012 to 2013 and as Carrie the psycho nanny in The CW drama One Tree Hill from 2008 to 2009. In 2013, she starred as Maggie Hall in the seventh and final season of the Lifetime drama Army Wives. In 2015, she began starring as Dr. Natalie Manning in the NBC medical drama Chicago Med.