Harry Potter star Josh Herdman was thrown out of a hotel in Copenhagen after a drunken romp in public.

The 22-year-old actor plays bad-guy Gregory Goyle in the movies and he had earlier shocked fans at the Collectormania convention in Copenhagen with his drunken behaviour.

Herdman was later treated by paramedics when he continued drinking after getting drunk on a flight to the Danish capital.

A source at the convention said: “Herdman was an utter disgrace. He was out of his skull when he arrived and his behaviour got worse. Lots of kids came to see him.

“He was meant to meet them with a smile and sign autographs. But they were greeted by a scowling, offensive, foul-mouther drunk.”

His appearance was cut short by organisers and he reportedly carried on drinking at his hotel.

An onlooker said: “He came into reception and started screaming abuse at Collectormania’s organisers. At one point, he screamed: ‘I am a regular cast member in the biggest movie franchise in cinema history and you will NOT speak to me like that!”

A cleaner then went to find security when she saw Herdman writhing around on a sofa with a blonde on his lap and the twosome were asked to leave the hotel.