Courtney Ruth Miller (born June 19, 1995) is an American YouTuber, actor, writer, and director. She first appeared in The Mother's Day Rule video as Ian's sister and was first introduced to the Smosh Family in the video Hand Bomb, along with Shayne Topp. She was inducted into the Smosh recurring cast in mid-2015. Courtney got her start in the public eye when she began posting on Vine. Through the platform, she met Olivia Sui, who convinced her to audition for Smosh, and ultimately got her the job. Courtney began posting Vine videos in the video service's first year, 2013, and stopped by its shutdown, in 2016. Courtney co-hosted Smosh's Seriously Super Stupid Sleepover with Olivia on the Smosh 2nd Channel (now Smosh Pit), replacing Mari Takahashi's show Smosh Pit Weekly from September 2015 to May 2017. The pair then hosted the short-lived series Whoa! Nature Show between August and December 2017. After Smosh's acquisition by Mythical Entertainment, she would go on to host Eat It or Yeet It, Why We're Bad At Dating (with Shayne), some episodes of the SmoshCast, and recently, Culinary Crimes. Since 2018, Courtney became a writer for main channel videos (with the addition of her first writing role in "They KISSED Instead Of Paying!" in 2016), and since 2019, she also became a director for the main channel and Smosh Pit videos, including the paid live-streaming event, Anthony is Dead: The Funeral Roast. On October 21, 2022, she launched Courtney's Rack, an online apparel rental subscription service that features an apparel catalog inspired by Courtney's style of clothing.