Miley Cyrus has posted a clip of herself and Avril Lavigne having a cat-fight backstage at her Bangerz tour show in Toronto, Canada.

In the short video, Lavigne can be seen waltzing into Mi-Cy's dressing room to meet the Wrecking Ball singer, which results in both ladies getting their claws out in an epic 'I'm more famous than you in Canada' battle.

Clutching a fake tabloid report baring Avril's face with the headline 'Most famous, beautiful, & popular in CANADA', Miley exclaims: "I’m in f**king Canada?!”

The Sk8er Boi hitmaker then enters the room, flicks her hair and informs Miley: "Oh hai Miley. I’m actually, like, the most famous person in Canada.”

Cyrus then responds: "I may not be Canadian, but I’m the most famous person IN Canada — ya dumb f**kin’ b*tch.”

The two then start cat-fighting, before the video cuts out.

Avril later posted two snaps of herself and Miley mid-battle on Instagram, with one carrying the caption: "I'll beat your Ass B*tch."

We are hoping no popstars were hurt in the making of this film…