Britney Spears has revealed her reasons for shaving her hair off in 2007 in her upcoming memoir.The pop icon first announced her new tell-all memoir The Woman In Me back in April, and has since shared excerpts from the highly-anticipated book. In the book, which is out next week (October 27), she speaks about the many headlines she has faced throughout her career, including the time she shaved her hair 16 years ago.“I’d been eyeballed so much growing up,” she explained in an excerpt, obtained by PEOPLE.