The pop star inked the word 'swaggy' and a cartoon mouse on tattoo artist Bang Bang

Justin Bieber has been found to have illegally tattooed a friend, inking him without a licence.

Last summer the pop star inked a piece on tattoo artist Bang Bang in New York City, drawing a mouse and writing the word ‘swaggy’ on his leg.

Bieber’s actions could now result in a $2000 (£1313) fine from the New York City Health Department, reports New York Daily News.

Back in 2009, Rihanna also tattooed Bang Bang – real name Keith McCurdy – and the Health Department cited the tattoo parlour for “operating with an unlicensed tattoo artist on site.”

Earlier this week Justin Bieber was criticised for abandoning his pet monkey after the animal was recently taken off him by German customs officers.

Bieber had attempted to take 14-week-old Mally into Germany but the monkey was seized when the pop star was unable to provide the correct paperwork needed for an animal to cross the border into the country.

Mally has been left in quarantine as Bieber’s world tour continues through Vienna, Berlin and Hamburg. The Sun reports that Mally is staying in a medical facility.

Kurt Grabenwoeger, a vet at the Munich shelter where Mally is staying, criticised Bieber for using his pet as a fashionable accessory. “These monkeys not only need to be with their mothers for at least a year, but they should also be surrounded by their family group. They are living creatures – not celebrity accessories like a handbag.”

Mally will be placed in permanent care if he is left for four weeks. Meanwhile, Justin Bieber recently criticised the press for the way he is treated, saying that he is sick of having to keep the media happy.