Sierra Nikole [=McCormick=] (born October 28, 1997) is an American actress who has appeared in over 20 films and TV series. She is best known for her role as Olive Doyle in the Creator/DisneyChannel KidCom ''Series/ANTFarm'', her participation in the U.S. game show ''Series/AreYouSmarterThanAFifthGrader'' and her role as the demon UsefulNotes/{{Lilith}} in Creator/TheCW series ''Series/{{Supernatural}}''.

[[https://twitter.com/SierraNMcCormic She also has a Twitter]] [[http://instagram.com/sierramccormickxoxo and an Instagram]].
!!Tropes that apply to Ms. [=McCormick=] include:
* CelebrityEndorsement: [[http://www.peta2.com/heroes/sierra-mccormick-adoption-ad/ She's appeared in a peta2 adoption ad]].
* ColbertBump: She had small parts in ''Series/CurbYourEnthusiasm'', ''Film/LandOfTheLost'' and ''Film/RamonaAndBeezus'' (among others) before ending up in ''Series/ANTFarm''.
** She ''and'' Music/ChinaAnneMcClain appeared together in an episode of ''Series/HannahMontana''.
* CreepyChild: She's often typecast as this.
* FanCommunityNicknames: Sierra Bears.
* OneOfUs: She enjoys ''Series/{{Sherlock}}'', ''Literature/TheGreatGatsby'' and Creator/ChristopherNolan.
* TeenIdol: Although she's been acting since she was nine.
* TypeCasting: She's typically cast as one of various types of strange girls, most frequently the {{Cloudcuckoolander}} (''Series/ANTFarm'') and CreepyChild (''Series/{{Supernatural}}'', ''Series/{{Jessie}}'').