Tori Spelling and Dean McDermott’s rough patch looks like it’s about to get a whole lot rougher, thanks to none other than his ex-wife.

Dean’s ex, Canadian actress Mary Jo Eustace, is reportedly planning to spill her secrets about her marriage to the recently-rehabbed star, and it’s making Tori, his wife of nearly eight years, more than a little bit nervous.

Waiting to hear about an amazing project - spilling all my secrets,” tweeted Mary Jo in late February.

While Mary Jo hasn’t made an official announcement regarding a new book, airing her family’s dirty secrets is nothing new for the 51-year-old actress.

In 2009, Mary Jo dished some dirt on her divorce with her book Divorce Sucks: What to do when irreconcilable differences, lawyer fees, and your’ ex’s Hollywood wife make you miserable, but with the recent allegations that Dean has been cheating on Tori, it seems as though his ex may have some more to say.

Dean, who began seeing Tori while he was still married to Mary Jo (and in the process of adopting the couple’s second child together) has allegedly been up to some of his old tricks recently, and Mary Jo has had no problem voicing her opinions on the matter.

Following the announcement that Dean had entered rehab for “some health and personal issues,” Mary Jo told reporters (via RadarOnline.com), “I wish Dean only the best in his struggle to overcome the demons he has been wrestling with for many years, so he can become the father and the man I  know he wants to be.”

Do you think Tori should be worried about what Mary Jo has to say about Dean?

Source: Twitter / RadarOnline.com