Finding time to work out is a challenge for everyone, especially busy Hollywood celebs who are desperately juggling work, family and fame, but a new book offers a fun and fabulous way to burn calories – in bed!

“These moves are great for celebs on-the-go who travel a lot and need a hotel room workout, but don't want to touch the dirty floor,” revealed author Laurel House, whose book QuickieChicks Cheat Sheet to Life, Love, Fitness, Food, Fashion, & Finance... on a Less than Fabulous Budget hit shelves on Tuesday.

Could the most infamous and horrific crime of its time, and one of the most notorious cold cases in history, have been committed by a woman?

That is the theory suggested in a new book, Hand Of A Woman, about Jack the Ripper, and RadarOnline.com has exclusive details on the compelling evidence from author John Morris, who claims to know the identity of the murderer who has mystified investigators for over a century.

Ryan O'Neal showed up Monday at 30 Rock In New York for an exclusive interview on the Today show, but canceled at the last minute, saying he didn't feel well.

The 71-year-old Love Story actor -- who earlier this month revealed he has stage 2 prostate cancer  -- was scheduled to appear on Today to talk about his controversial new memoir, Both Of Us, My Life With Farrah.

A blockbuster new book has lifted the lid on the life of the late John Lennon, alleging the rock icon was bulimic, RadarOnline.com is exclusively reporting.

BackStage Pass VIP, reveals the human side of rock music legends, including Lennon, who died in December 1980, and describes the poignant struggles the musician had with eating disorders.

Nicole Scherzinger has put the X into The X Factor with a sexy nude shot that is hitting bookshelves, RadarOnline.com has learned.

In the new coffee table book Culo by Mazzucco, the former Pussy Cat Doll flashes her best asset along with dozens of other celebrities to celebrate the beauty of the female behind.

Scherzinger's naughty but nice nude pose shows her paying tribute to her Hawaiian roots wearing a floral lei around her neck, with her bare back and legs painted with henna tattoos and her dark hair flowing freely -- but her butt is exposed for all to see.

The unusual collection of photos has been created by Sean "Diddy" Combs, Interscope-Geffen-A&M Chairman Jimmy Iovine and fashion photographer Raphael Mazzucco.

Jersey Shore fans are used to seeing Snooki falling over drunk and smushing with guidos, but the reality TV star wishes there were less shenanigans on the show.

In an interview with on GQ.com, the pint-sized star opened up about the MTV hit, books, politics and veterinary school, and RadarOnline.com has a sneak preview.

The reality star turned book author told the men's magazine that if she produced Jersey Shore she would make some serious changes to the editing.

"I wouldn't show as much drinking and partying. I would show more of us chilling out and having a good time ---which they don't show," said Snooki.

Michelle Obama is transitioning from First Lady to author, and RadarOnline.com has a sneak peek of the cover of her first book, American Grown: How the White House Kitchen Garden Inspires Families, Schools and Communities.

The Obama’s changed the way they eat a few years ago when their pediatrician became concerned with their daughters’ Body Mass Index (BMI), and the book will detail how they got rid of sweets, processed foods and juice boxes, according to iVillage, who were the first to get Michelle’s book cover.

“It was really we just substituted real food for processed food,” Michelle said at the White House.  “That was really the major difference. So grape juice was actually juice from a grape,” she said to laughter, “which was pretty cool."

Skinny British socialite and style icon Daphne Guinness gets up close and personal in her new book, which accompanies her exhibition at The Fashion Institute of Technology in New York. 

The 43-year-old, who is famous for making controversial statements like “I’ll eat when I’m dead” offers her fans insight into her obsession with fashion, her bourgeoisie upbringing and why she is grateful to be thin in the photo-filled coffee table book – and RadarOnline.com has picked out her 10 most interesting quips from the book, which will be available in the United States later this month.

PHOTOS: Inside The Pages Of The New Daphne Guinness Book

She was married to one of the most notorious bad boys in Hollywood and has had more drama in her 40-years than most woman half her age, and now Denise Richards is lifting the lid on her life to write an ‘inspirational’ memoir.

In an exclusive interview with RadarOnline.com the ex-Mrs Charlie Sheen opened up about her new book and explained why she wants to tell the world about the love story behind her failed marriage.

PHOTOS: Denise Richards In The Bahamas With Her Daughters By Charlie Sheen

"I get into the good stuff about my marriage, because people have only read the rotten stuff," she said, describing the content of the book which is due for release on July 27.

"So, you know, there was a beautiful love story between he and I and then it went the way it went.