Over 3.1 billion viewers for the video for "Despacito"! Officially the #1 most watched YouTube video of all time! The rest of the top 10... 

10 - Major Lazer - Lean On 

9 - Katy Perry - Roar 

8 - Maroon 5 - Sugar 

7 - Enrique Iglesias - Bailando 

6 - Taylor Swift - Shake It Off 

5 - Mark Ronson/Bruno Mars - Uptown Funk 

4- Justin Bieber - Sorry 

3 - PSY - Gangham Style 

2 - Wiz Khalifa - See You Again w. Charlie Puth (tribute to Paul Walker)

Watch them all here