Fans of New Zealand pop superstar Lorde have been left scratching their heads over why the Grammy-nominated artist is not performing at this year's awards.

Lorde's second album Melodrama has been nominated for Album of the Year at this year's Grammy awards and she is the only female artist in the category.

According to Variety, Lorde was the only artist in the category not asked to do a solo performance which has sparked concerns about sexism in the industry.

Lorde's mother Sonja Yelich tweeted "this says it all -" followed by an excerpt from the New York Times that reads, Of the 899 people nominated in the last six Grammy Awards, the report found 9 percent were women.

this says it all -@nytimes January 26, 2018 pic.twitter.com/R3YdHwieXf

— Sonja Yelich (@sonjayelich1) January 26, 2018

It follows, This year, Lorde is the only woman nominated for album of the year; she is not scheduled to perform.

The Grammys are tomorrow afternoon (NZ time).