Bristol Palin, the 20-year-old daughter of former Alaska governor Sarah Palin, seems to have put down her dancing shoes and picked up the pen. A book listing on Amazon, under the heading "Untitled Bristol Palin Memoir,” says that the 304-page book is due to hit the shelves June 21. Back in November, Palin family friends told PopEater that Bristol was working on a book, but the nature of it was undisclosed. According to the Amazon listing, the memoir will be published by William Morrow & Co., an imprint of Harper Collins. Neither the publisher nor Palin's rep immediately responded to...