Prince Harry kept up his wild child reputation by attending an illegal rave in Whitechapel last Thursday, according to a new report.

The party - which was arranged via the pages of social networking site Facebook - opened its doors for society's upper class elite, including the young royal.

The prince and his pals raved in a rundown office block in East London for the birthday of Davina Harbord - sister of 27-year-old Astrid Harbord, a rumoured romantic interest of Harry's.

Tatler magazine has dubbed the two women the "Hardcore Sisters" for their notorious partying ways.

A guest list found in the building included, Harry’s friend Guy Pelly and ex-girlfreind Chelsea Davy, Prince William’s former girlfriend Arabella Musgrave and the 26-year-old daughter of Cirencester Park Polo Club manager Major Nicholas Musgrave.

An official at Tower Hamlets council told the Daily Mail: "The building is known to us in connection with illegal parties.

"It doesn’t have a drinks or entertainment licence, so anyone involved in those activities is breaking the law."

A royal source said: "The Prince had no idea of the legal status of the party."