Hustler Magazine founder Larry Flynt is offering up to $1 million for Mitt Romney's tax returns or any other information about the candidate's personal finances.

Flynt took out two full-page ads — one in Sunday's Washington Post and the other to run Tuesday in USA Today — seeking Romney's "unreleased tax returns and/or details of his offshore assets, bank accounts and business partnerships," according to Adweek.

The notorious porn publisher and free-speech fighter will pay a reward for "documented evidence," and promises to keep any informants' names confidential.

Romney has released his 2010 return and part of his 2011 return (the rest due to be released in October) but has so far refused calls to provide any tax information prior to 2010. Critics charge he hasn't paid his fair share on the millions, or billions, he made in his days as a businessman and the head of investment firm Bain Capital.

Last week, a hacker group claimed to have stolen Romney's pre-2010 tax returns from a PricewaterhouseCooper's office in Tennessee and demanded $1 million to not release the information on Sept. 28.