Lorde has hit out at ''spineless'' music critics.

The New Zealand singer has taken to her Tumblr account to post a blog slamming Complex magazine which gave rapper Iggy Azalea a poor review for her new album 'The New Classic', after featuring her on the cover.

Lorde posted: ''Bugs me how publications like complex will profile interesting artists in order to sell copies/get clicks and then shit on their records. It happens to me all the time - [music website] Pitchfork and that ilk being like 'can we interview you?' after totally taking the p*ss out of me in a review. (sic)

''Have a stance on an artist and stick to it. Don't act like you respect them then throw them under the bus.''

Iggy backed Lorde on Twitter, posting: ''I agree @lordemusic media LOVE to flop about, But when you're completely spineless Im sure its hard to stick to even ur own opinion #GoGirl. (sic)''

Complex magazine later responded to Lorde's blog post, explained its reasoning behind the review in a comment piece from associate editor Insanul Ahmed.

He said: ''No one should stick to their opinion when new facts (possibly in the form of new music) are made available that can alter your views. Art and artistry are fluid things.

''Celebrities seek attention and media coverage every time they do something great, why would the camera stop rolling when they do something not so great? And even if they do, it isn't meant to be disrespectful - it's meant to be critical.''