Robert de Niro, Madonna, and Elton John fell victim to hackers

Hackers hacked the computer system of the Grubman Shire Meiselas & Sacks law firm in New York, which serves stars, including Robert De Niro, Madonna, and Elton John.

The attackers have already reported that the stolen information includes contracts, non-disclosure agreements, e-mail addresses, telephone numbers, and personal correspondence. Hackers are demanding $21 million from victims and the company for personal data return, threatening to make the documents public.

"We can confirm that we have been the victim of a cyber attack. We have notified our customers and staff and hired experts who specialize in this area to resolve all issues," the company said in a statement.