The book is dedicated to her two sons, but the pop icon penned a special note to her fans: “You have my heart and gratitude forever. This book is for you.”

Spears credits her fans with giving her strength in the darkest hours of her fight for freedom. “I don’t think people knew how much the #FreeBritney movement meant to me.”

She was offered a part in the 2002 film adaptation of “Chicago” as “a villain who kills a man, and sings and dances while doing it, too.”

“I should’ve done it. I had power back then; I wish I’d used it more thoughtfully, been more rebellious,” she writes. “If only I’d been brave enough not to stay in my safe zone, done more things that weren’t just within what I knew. But I was committed to not rocking the boat, and to not complaining even when something upset me.”

Abortion after pregnancy with Timberlake’s baby

Spears details her relationship with Justin Timberlake, from their first kiss at a “Mickey Mouse Club” party to their iconic denim-on-denim looks from the 2001 American Music Awards.

“But there were a couple of times in our relationship when I knew Justin had cheated on me.”

When she became pregnant, “It was a surprise, but for me it wasn’t a tragedy.”  She always wanted a family with Timberlake. When he didn’t share enthusiasm, Spears agreed to have  abortion. “If it had been left up to me alone, I never would have done it. Justin was so sure that he didn’t want to be a father.”

Abortion: Physical Pain

Spears describes the physical pain of the abortion, calling it “one of the most agonizing things I have ever experienced.”

Timberlake broke up with Spears via text message while she was on the set of the “Overprotected” Darkchild remix music video.

Two-week fling with Colin Farrell

After her breakup with Justin Timberlake, Spears dated Colin Farrell. She found out he would be filming nearby, so she crashed the set of “S.W.A.T.”

“We would be having a two-week brawl. Brawl is the only word for it – we were all over each other, grappling so passionately it was like we were in a street fight.”

Diane Sawyer interview: “breaking point”

Spears was told by her team that she’d be expected to speak with Diane Sawyer on the couch in her apartment, much to her chagrin: “I’d often retreated to my apartment to be alone.”

Spears wasn’t told any of the “100 percent embarrassing” questions ahead of time. “I shouldn’t have been forced to speak on national TV, forced to cry in front of this stranger woman.”

She calls the interview “a breaking point for me internally, but I had no choice. It seemed like nobody really cared how I felt.”

She was “really let down” by sister Jamie Lynn

When she was held in a mental health facility under her conservatorship, she texted younger sister Jamie Lynn asking to help get her out. “Stop fighting it. There’s nothing you can do about it, so stop fighting it,” she responded.

When Britney returned from the facility, Jamie Lynn pitched her on joint projects, including a sister talk show, a sitcom and a rom-com.

Once the conservatorship ended, Britney felt “betrayed” by her family. “My sister and I should have found comfort in each other, but unfortunately that hasn’t been the case. As I was fighting the conservatorship and receiving a lot of press attention, she was writing a book capitalizing on it.”