Britney Spears goes fully nude to celebrate ‘historic’ book sales

Oops… she posted a nude again.

Britney Spears celebrated the “historic” success of her new memoir “The Woman in Me” in an NSFW Instagram post Thursday.

The 41-year-old “Piece of Me” singer posed with her bare backside toward the camera on an unidentified beach as she covered her breasts with her arms.

The Post has contacted a rep for Spears for comment.

The “Toxic” hitmaker’s book, which hit shelves Tuesday, holds the No. 1 spot on Amazon’s Best Sellers and Barnes and Noble’s Best Sellers lists.

She thanked fans for their support in making the book a best seller Tuesday in a since-deleted Instagram post.

“It’s happening!!! My book is the highest-selling celebrity memoir in history and it’s only day 1!!!,” she captioned the post.

“Thank you to the fans who have been so supportive!!! Love you all!!! #TheWomanInMe @gallerybooks @simonandschuster.”

Spears has a controversial history of baring it all on Instagram but explained why she loves to post all-natural snaps of her figure in her book.

“I know that a lot of people don’t understand why I love taking pictures of myself naked or in new dresses,” she wrote.

“But I think if they’d been photographed by other people thousands of times, prodded and posed for other people’s approval, they’d understand that I get a lot of joy from posing the way I feel sexy and taking my own picture, doing whatever I want with it.”

In addition to profiting off her book sales, Spears has another reason to celebrate as her music catalog is up 21% in Streams, Billboard reported.

“In the four days prior to the release of ‘The Woman in Me’ (Oct. 20 to 23), Spears’ catalog earned 8.89 million official on-demand US streams — a 21% increase from the previous Friday-to-Monday tracking period (Oct. 13 to 16), which earned 7.34 million streams,” according to Luminate.