Johnny Cash once offered to fund his entire staff's facelifts, according to a revealing new look inside the country great's private world.

PEGGY KNIGHT, who worked for Cash and his wife JUNE CARTER CASH for 33 years, has written a book about country music's first couple because she wants everyone to know just how generous her boss was.

In MY 33 YEARS INSIDE THE HOUSE OF CASH, Knight recalls Cash offering his female staff members facelifts - as a gift.

She says, "One day he came to us and said, 'I'm giving all you girls a facelift if you want it, all expenses paid."

Knight remembers three of her colleagues taking Cash up on his offer.