According to a report, the ex-wife of Jessica Simpson's fiancé is planning to release a tell-all book about her marriage with Eric Johnson.

Keri Johnson, has reportedly been planning to release a book chronicling her scorned relationship for a while. In it, Johnson will expose all the happenings in their failed marriage when Simpson began dating Johnson while they were still married.

This can't be good news for Simpson who is pregnant again with the former football player's child. 

The source told Celebuzz:

"She's always thought about writing a book through their divorce. She actually started writing during the divorce to cope with what was happening."

Keri is using the book as an outlet to finally tell her side of the divorce, the source said. "She just wants to be honest. Keri wants to detail the divorce from her own perspective and what happened, and inevitably Jessica would be a part of that."

Eric Johnson formally separated from his ex in October 2009 and filed for divorce in January 2010. Eric was still married to his wife when he began dating Simpson.

Simpson and Johnson are expecting a baby boy, according to a recent report by Radar Online. Daughter, Maxwell Drew will soon be big sister to a new baby brother later this year. “It’s Jessica’s dream come true, she prayed she was having a boy,” a close family source told Radar.

Simpson, 31, found out the sex of the child during a routine doctor visit last week. The source shared that the couple is elated and are already thinking of names for their son.

“She found out this week after a check-up at the doctor, who asked her if she wanted to know the sex of the baby. Jessica immediately said yes and when the doctor told her it was a boy she screamed with joy,” the source said. “What with everything going on in her personality life, and her problems with her father, this has given her something to smile about.”

Tags: Jessica Simpson Eric Johnson Maxwell Drew Erica Johnson