Katherine “Kat” Grace McNamara (born November 22, 1995) is an American actress. She is known for her role as Harper Munroe on the MTV comedy series Happyland, and for her role on the Freeform fantasy series Shadowhunters where she plays the lead character, Clary Fray.
McNamara was born in Kansas City, Missouri. She graduated from high school at age 14, and went on to graduate college with a bachelor’s degree by age 17.
McNamara began her acting career on Broadway, appearing in “A Little Night Music” with Catherine Zeta-Jones and Angela Lansbury. She began guest starring on television shows including Drop Dead Diva and 30 Rock.
McNamara has appeared in theatrical movies such as New Year’s Eve, and appeared in the Disney Channel original movie Girl vs. Monster playing the role of Myra Santelli. She co-starred in the film remake of Tom Sawyer and Huckleberry Finn, playing the role of Tom’s girlfriend Becky Thatcher. McNamara also appeared in the independent movies Contest and A Sort of Homecoming.
She appeared on three episodes of the Disney XD series Kickin’ It, in which she had a recurring role as Claire, Kim’s rival, and in two episodes of the Disney Channel series Jessie, playing Bryn Brietbart a rival to Emma Ross. She also appeared in an episode of the Nickelodeon series The Thundermans.
McNamara was cast in the MTV series Happyland as Harper, a resident of the park who pursues a boy despite the fact that she already has a boyfriend. It was announced that McNamara would playing the recurring role of Kat on the third season of The Fosters in 2015.
McNamara appeared in the film sequel to The Maze Runner, Maze Runner: The Scorch Trials, as Sonya, a co-leader of Group B.
It was announced on May 6, 2015 that McNamara would be playing Clary Fray, the lead character in Shadowhunters, the Freeform television adaptation of Cassandra Clare‘s best-selling book series The Mortal Instruments.