Can you believe that ‘Hollaback Girl’ is ten years old this year? Gwen Stefani took The Voice US viewers back to 2004 with the help of Pharrell Williams.

These guys are a match made in pop music heaven. Gwen and Pharrell are longtime collaborators and Gwen even did a guest spot during his Coachella set this year. Now, the man of the moment joins Gwen on stage at The Voice.

Not only are they best friends, but we can only assume that they come from the same ageless illuminati cult.

Seriously, what the fuck?

Watch the performance below:

https://www.youtube.com/watch?v=cSMY3I_ES_g