Katy had some pretty stiff competition, including Psy's 'Gangnam Style,' which got so many views since it was first published in 2012, that it actually broke YouTube's video counter.
We're not talking about 2012, though, we're talking about 2014 and this was definitely the year of Katy Perry. In addition to this huge YouTube achievement, the pop star was also named one of Spotify's most streamed artists.
The 'Dark Horse' YouTube video has already racked up over 725 million views and it got a late start to the year, being uploaded in February!
Other "most watched" videos for the year were Shakira and Rihanna's 'Can't Remember to Forget You,' Iggy Azalea and Charli XCX's 'Fancy,' Sia's 'Chandelier and, of course, Taylor Swift's 'Shake It Off.' Basically, girls totally won YouTube this year...and we're not surprised!