The outspoken DJ went public with his thoughts about the odd couple, insisting the pop star had used Skrillex as "a goddamn tool" when they teamed up with Diplo for Where Are U Now, and now the hitmaker, real name Sonny Moore has hit back.

"If he (Deadmau5) was a real friend, he would come to me and be like, 'Yo, you shouldn't be working for Justin Bieber', rather than blowing it up all over the Internet and going out of his way to make people feel wrong for making a choice in their life," Skrillex tells Rolling Stone magazine.

"I would say to him, 'I enjoy working with Justin Bieber!' I'm a fan of his voice. And if you're a producer and you get an opportunity to work with someone who's the biggest artist in the world - for better or for worse - what would you say? Would you say no?"