Canadian pop star Justin Bieber's long blond locks are no more.

The Love Yourself singer debuted his new hair style, an undercut man bun, via Instagram with a photo which now has over 1.6 million likes and over 40,000 comments.

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Fan reaction to his new hair has so far been mixed.

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"@justinbieber THE HELL YOU DOING WITH YOUR HAIR BOY? THAT BUN THING IS RIDICULOUS. STOP IT," one fan tweeted.

"@justinbieber keep your hair this way... go with the man bun... live the man bun life..." another tweeted.

Bieber's new 'do' comes after model girlfriend Hailey Baldwin pressured him into getting cornrows during their Caribbean holiday. Photo / Getty
Bieber's new 'do' comes after model girlfriend Hailey Baldwin pressured him into getting cornrows during their Caribbean holiday. Photo / Getty

Bieber's new 'do' comes after model girlfriend Hailey Baldwin pressured him into getting cornrows during their Caribbean holiday.

"Hailey made me get cornrows like an absolute douche bag, these will be of (sic) tomorrow trust me," he captioned an image of his new hair to Instagram.

Bieber first showed off his platinum hair in September during a US performance on The Today Show.

- AAP