Alana Stewart, Farrah Fawcett’s best friend of more than 30 years, is publishing a diary she kept of the late actress’ battle cancer.

The iconic pinup model and star of the ’70s series Charlie’s Angels died June 25 after a lengthy fight against anal cancer. She was 62.

My Journey With Farrah will be released through publisher William Morrow, an imprint of HarperCollins, in August. Some of the proceeds will be donated to the Farrah Fawcett Foundation for cancer research.

The book will contain never-before-seen photos and deeply intimate revelations on life and spirituality.

“When the idea to do this book was presented to me, I thought long and hard about it,” the former wife of rocker Rod Stewart said of her decision Monday.

“In fact, I agonized over the decision. Now, was I doing the right thing by sharing many of our private moments? Farrah had originally encouraged me to write this book. It was her idea. However, while I was contemplating my decision, her health took a turn for the worse, and I could no longer seek her advice. So I turned to Ryan O’Neal. He was so positive and so supportive. ‘You have to do it’, he said emphatically. ‘There will be lots of people writing books about her. Yours will be the truth, and it will be a wonderful tribute to her. You have to do it!’ My hope is that people will find this book to be a heartfelt tribute to my friend of 30 years and her valiant fight against cancer. I also hope that it will be helpful and supportive to all of those people who have loved and cared for someone close to them with a lingering illness. I realized while I was putting it together that it was a way of keeping Farrah’s memory alive, not only for me but for everyone who reads this book.”