If rumors are true, we'll finally find out what really happened the night Solange Knowles attacked her brother-in-law.

Bey Posts Photos of Solange Days After FIght Revealed

Word is Beyoncé's younger sister, actress and DJ Solange, is planning to write a tell-all book that will reveal all of the infamous family's deepest and darkest secrets. According to the newest issue of In Touch Weekly, Solange will give fans "All the dirt you want to know" about the infamous night as well as Jay Z and Beyoncé's marriage. The magazine implies that Solange will open up about a fake baby bump -- most likely Beyoncé's considering she faced lots of controversy when fans wondered if she was really pregnant with Blue Ivy -- as well as infidelity and abuse.

The magazine also reports that Solange is penning the book now that she has had enough of living in Beyoncé's shadow; on top of the Drunk in Love singer allowing Jay Z to be a womanizer.

Solange Doesn't Like How Jay Z 'Controls' Beyoncé?

An insider close to the family said, "Solange will always [be] in the background while Beyoncé was the golden child. She's sick of being held down and she's ready to fight back."

As far as cheating rumors, a source claimed Solange will reveal insecurities Beyoncé allegedly deals with when it comes to other famous women; specifically singers on Jay Z's Roc Nation label Rita Ora and Where Have You Been singer Rihanna.

An insider said, "Beyoncé is so insecure about it."

Solange is also rumored to be shedding light on their estranged father, Mathew Knowles, who managed Destiny's Child and Beyoncé's careers.

Rumors of a tarnished relationship between Solange and Jay Z began circulating after a surveillance video of the Johnson Family Vacation actress fighting Jay Z went viral. It all went down in an elevator after this year's Met Gala in New York City.

Check out the video below and some of Solange and Beyoncé's best moments in the slideshow above.