Singer was performing in Portland, Oregon on Sunday (March 13)
Singer had described Nate Diaz's style as 'terrible'
Pop sensation continuing recent journey into dance music
Singer helped charity single to the UK top spot in December
Singer delivered a freestyle that didn't make the final cut
The almost-22-year-old singer had early celebrations this weekend
It's currently unknown whether the song was a leftover from his hit 'Purpose' LP
Sia, David Guetta, Faithless, Kaiser Chiefs, Bastille and Little Mix will also perform
Also featuring Lily-Rose Depp, Elisabeth Moss, Natasha Lyonne and Ellen Page
Stars pictured together at a Saint Laurent fashion show in Los Angeles