Anastasia Karanikolaou is an American YouTuber.

Born Anastasia Karanikolaou and known online as Stassiebaby, she gained immense followings on Instagram, Vine, and Twitter. She is perhaps best known as a best friend of Kendall and Kylie Jenner. She has more than 10 million followers on Instagram.

She became friends with the Jenners around the age of 11.

She is a close friend of the Jenners, as are Jordyn Woods, Jaden Smith, and Hailey Baldwin. She has earned income from modeling.