What went wrong for these two? Was it a mutual decision? Jenna offers some explanations and opens up about her experience in her new book called Gracefully You: Finding Beauty and Balance in the Everyday.

This book is the first time she's speaking out about what happened between her and Channing. "[Divorce] was never on my docket of dreams," she wrote in her book, which was excerpted on E! News, "but alas, here I am, learning and growing through one."

She explains that at first, she used all the "typical remedies" to feel better about the breakup, from drinking wine with friends to letting herself just cry it out. When the media got ahold of the story and the coverage became relentless, Jenna wrote that she was "in a state of shock... The pain hit my like a tumbling avalanche. I was completely overcome with fear and sadness."

Although she doesn't explicitly say why Channing and she broke it off, she does write, "I started to wonder if everything I believed in and always talked about was real. Could anyone or anything ever be trusted?"