EXCLUSIVE

UPDATE: 5:28 PM PDT: The list has just gotten longer. We've learned Britney Spears and Donald Trump have also been hacked.



Twelve big celebs and political figures, including Jay-Z, Beyonce, are the victims of a hacker who has posted detailed information about what appears to be their finances ... and we've learned law enforcement is on the case.

A website -- we're not disclosing the name -- has posted social security numbers, mortgage amounts, credit card info, car loans, banking and other info of major celebs. In addition to Beyonce and Jay-Z ... the site has snagged financial dossiers of Kim Kardashian, Paris Hilton, Mel Gibson, Ashton Kutcher, Joe Biden, Robert Mueller, Hillary Clinton, Eric Holder and LAPD Chief Charlie Beck.

The site was not able to get a lot on Joe Biden or Hillary Clinton, but most of the others on the list have had their financial info compromised.