How do you follow up having a baby out of wedlock at 18, and competing on Dancing With the Stars? You write a memoir, of course. And Bristol Palin is doing just that. According to a listing on Amazon.com, the Palin progeny is penning her life story and HarperCollins' William Morrow subsidiary is publishing it. No word yet on the title of the book, priced at $25.99. It's in vogue for Palin family members to write memoirs—Mom's Going Rogue netted her a $1.25 million advance.