John Edwards Promised to Wed Mistress; Dave Matthews to Play Ceremony

 Paul Adao/

John Edwards promised mistress Rielle Hunter that he'd marry her once his wife Elizabeth died of cancer, Edwards' former aide alleges in a shocking new book proposal.

According to a copy obtained by the New York Times, Andrew Young claims Edwards told Hunter that the ceremony would take place on a New York rooftop and feature an appearance by the Dave Matthews Band.

As has been previously reported, Young also claims in his proposal that Edwards fathered Hunter's daughter, Frances Quinn Hunter, who is 19-months old.

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Young has claimed he was the father of the girl. But in the book proposal he explains how Edwards always knew he was Frances' dad and begged Young to cover for him by falsely claiming he was the father.

Last May, Edwards' wife Elizabeth (who is battling terminal breast cancer) told Oprah Winfrey she has "no idea" if her husband is the baby's father. (No father is listed on the baby's birth certificate.)

Asked about the speculation, Elizabeth told Winfrey, "I've seen a picture of the baby. I have no idea. It doesn't look like my children, but I don't have any idea."

A spokeswoman for Edwards has yet to comment.

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