King began her professional acting career by guest starring in series such as Roswell, Hannah Montana and Workaholics. She starred as Adriana Masters in the Nick at Nite drama Hollywood Heights. It was there that she met The Young and the Restless executive producer Jill Farren-Phelps. "Jill brought me over there. I never auditioned for Y&R. As I was coming off the plane from Florida with a friend, Jill called and said, 'Do you want to come work on Y&R and play Summer?' I was like, 'Yeah.' She said, 'Okay. You start in two days.'"
King appeared as a guest model on two episodes of The Price Is Right during "Dream Car Week" in November 2013 and again for two more episodes in October 2014. In 2014, King was cast in A Girl Like Her originally named the The Bully Chronicles as the main antagonist Avery Keller, which is set to be released in 2015.
In 2013, King accused her Y&R co-star Michael Muhney of allegedly groping her. RadarOnline.com reported that King complained that Muhney fondled her breasts on two occasions, both of which were unsolicited and unwanted advances. According to RadarOnline.com, King told producers she would go to the police and file a report against Muhney if he was not fired from the show. Muhney was fired on December 17, 2013 with Muhney stating that the allegations were false and merely a salacious rumor.