[Samm]

Miley Cyrus has called Avril Lavigne a "dumb ******ing bitch" as the pair staged a play-fight over who is the most famous person in Canada.

The 21-year-old 'Adore You' singer appeared with Lavigne in the light-hearted Instagram video after she finished the Canadian leg of her 'Bangerz' world tour in Toronto last night.

http://instagram.com/p/mPSfroQzKy/

n the short clip, Cyrus is seen wearing a onesie emblazoned with a cannabis leaf pretending to read a magazine about how popular Lavigne is in her native country.

She then says: "I'm in ******ing Canada," before Lavigne appears.

The 'Let Me Go' singer says: "I am actually the most famous person in Canada," to which Cyrus replies: "I may not be Canadian, but I'm the most famous person in Canada, you dumb ******ing bitch."

http://www.digitalspy.co.uk/showbiz/...~oAdxzis8qKHVm

Miley's acting has gone down hill