Views: 2.80 Billion
The seventeenth most viewed video on YouTube is Dark Horse.

It features Juicy J and was released on September 17, 2013, by Capitol Records to help promote Katy Perry’s fourth studio album, Prism.
Dark Horse became an international commercial success, reaching the top 10 in 20 countries, selling over 13.2 million units worldwide, and winning several industry awards.

Katy also became the first female ever to have a video on YouTube with a billion views!