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.