Sims married Scott Stuber on September 24, 2011. The couple have one son, Brooks Alan Stuber (born June 19, 2012), and a daughter, Scarlett May Stuber (born March 25, 2015). On August 9, 2016, Sims announced she and Stuber were expecting their third child. On January 10, 2017, Sims gave birth to a son, Grey Douglas Stuber.