Celebrities are among the clients of a high-profile European plastic surgery clinic that was attacked by hackers, who today released thousands of intimate before-and-after images.

Grozio Chirurgija in Lithuania had its servers breached by a group known as Tsar Team, who broke in and stole more than 25,000 private photographs as well as personal information.

Over the past few months the hackers have attempted to blackmail thousands of victims from Britain, Germany, Denmark, Norway and the United States.

They were ordered to cough up $2,200 to stop the material, which included nude pre- and post-surgery pictures, from being made public, ABC News reported.

Among the haul was also copies of passports, address information and social security numbers, police said.