Maria ShriverMaria Shriver has been offered more that $15 million as an advance for a tell-all memoir.

Shriver, who filed for divorce from estranged husband Arnold Schwarzenegger on Friday (July 1), is the most sought-after person in the book world, according to RadarOnline.com. A top publishing exec estimates Shriver could nab a book advance of more than $15 million.

That amount would break the all-time record of $15 million advance for former U.S. president Bill Clinton's memoir, 'My Life.'

Shriver is already the author of six best-selling books, including 'And One More Thing Before You Go' and 'What's Happening to Grandpa?'

But should Shriver decide to write a tell-all about her life, from growing up a Kennedy, her marriage to Arnold Schwarzenegger, his reported and alleged extramarital affairs and love child, the book could set all sorts of sales records.