Investigations have been launched following released footage of the 29-year-old star with her head bowed being handcuffed on the tarmac.

It had been taken as she arrived at the Gold Coast airport on Sunday ahead of her headline performance at the Splendour In The Grass festival near Byron Bay.

Sky News reported that after stepping off her flight, the Hard Out Here singer asked one of the police officers assigned to escort her through the waiting fans to put her in handcuffs.

She then uploaded a picture to her Instagram account and tweeted the link to her 4.7 million Twitter followers, before it was taken down.

It has since been re-tweeted hundreds of times and liked by thousands on Instagram.

An Australian Federal Police spokeswoman said the officer who cuffed her had breached protocol and was facing “internal processes”.

“At her request, the members involved placed open handcuffs on Ms Allen for a photo opportunity,” she said.”It appears the members involved were caught up in the moment and standard protocols were breached.

“This matter is now subject to internal processes.”

Allen’s representative has not responded to requests for comment.

Image credit: Getty