Beyoncé is reportedly worried that a new tell-all book might reveal everything about her marital problems with rapper husband Jay Z.

According to Life & Style (via RadarOnline.com), journalist J. Randy Taraborrelli, who previously wrote about the late Michael Jackson, Marilyn Monroe, Diana Ross and the Hiltons, is investigating the hip-hop power couple's "claims of cheating, a lovechild, drug use and dirty business dealings."

Last month, the R&B diva and the Brooklyn emcee were allegedly caught fighting at a Los Angeles restaurant. Although they have been brushing off divorce rumors for a while, Taraborrelli's upcoming unauthorized bio, titled "Becoming Beyoncé," will unveil how "Bey and Jay were arguing so much, they needed a therapist" during their joint "On the Run" tour.

"There's even been allegations that they've split three times in the past four years - and discussed divorce each time," an insider revealed.

The upcoming book is also expected to elaborate on rumors that Hov has cheated. "There's juicy stuff about Rita Ora," the insider continued. "And about inappropriateness with Rachel Roy."

Moreover, the author will touch on The National Enquirer's breaking news report that the "Magna Carta Holy Grail" rapper might have a 21-year-old secret lovechild, aspiring rapper Rymir Satterthwaite.

Aside from the "Drunk in Love" duo's marital troubles, Taraborrelli is reportedly looking into the "7/11" hitmaker's sketchy business deals behind her innocent, clean image, although he said in a statement last year:

"Beyoncé has lived a most incredible, inspiring life. I know my readers will enjoy her journey."

The forthcoming shocking publication will hit bookstores later this year, and Beyoncé is "afraid the world will think she's a doormat."

"People will get to know the real couple -- and Beyoncé is terrified," the source added. "The book could prove her marriage is, and has been, in shambles."