16-year-old Sierra McCormick is an American actress and the younger sister of actress and model, Kayla McCormick.  She was born in Asheville, NC, and moved to Los Angeles at a young age where she started taking an interest in theater at which she  joined The Corsa Agency.

When Sierra was nine, she was one of the five 5th graders to appear in the U.S. game show Are You Smarter Than a 5th Grader? In 2008, she guest starred on the Disney Channel series Hannah Montana in 2008, as the role of Gillian.  During her following years, the young actress also co-starred with China McClain in the film Jack and Janet Save the Planet, starred in the film Ramona and Beezus with Selena Gomez in 2010 as Susan Kushner and the TV film A Nanny for Christmas in 2011, where she played Jackie Ryland.

Since 2011, Sierra is best known for her current role as Olive Doyle, a girl with an eidetic memory, in the Disney Channel Original Series, A.N.T. Farm alongside China McClain and Jake Short. Also, she has guest starred in three episodes of the Disney Channel series Jessie, with Peyton List, as Creepy Conni.