Solange Knowles is reportedly writing a juicy tell-all book about her famous family. According to In Touch (via Media Take Out), the "Losing You" singer wants to dish on Beyoncé and Jay Z's marriage and also Bey's rumored fake pregnancy.

Reportedly the book will reveal Bey and Jay's secret marital problems like cheating. MTO claims Solange also plans on dishing about their estranged father, Mathew Knowles. Apparently the alleged tell-all is still in the early stages but Solange was offered $20 million for it, MTO reports.

"Solange was always in the background while Beyoncé was the golden child," a source reportedly told In Touch. "She's sick of being held down and she's ready to fight back."

This rumor comes days after the family released a joint statement about an elevator fight at the Standard Hotel following a Met Gala after-party. In the nearly three-minute video, Solange is seen physically attacking her brother-in-law.

"Jay and Solange each assume their share of responsibility for what has occurred," the statement read. "They both acknowledge their role in this private matter that has played out in the public. They both have apologized to each other and we have moved forward as a united family."

Shortly after the statement was released, Beyoncé posted family photos to her Tumblr page. In a previous report by Media Take Out, Solange had agreed to be the opening act for Bey and Jay's "On the Run" tour.

Reportedly, the decision was made recently and she is expected to make about $8 million. The tour kicks off in June in Miami with the couple expected to stop in at least 13 cities across America. The tour wraps in California in August.

Along the way Beyoncé and her hubby will perform in cities like Dallas, Toronto, Philadelphia and Chicago. They have not announced a date for the Barclays Center in Brooklyn but will perform at the MetLife Stadium in New Jersey on July 11.