Tori Spelling is reallllly opening up about Dean McDermott's affair.

The former "Beverly Hills, 90210" star reveals how she found out that her husband slept with another woman in a new clip from her upcoming reality show "True Tori"... and it wasn't from him.

"I got a call from my publicist and she said, 'I just want to tell you something. It's a girl, and she's claiming that she had an affair with Dean in Toronto when he was there," Spelling explains. "'The girl has come forward. She's put her name to the story. She's giving all the details about her two-day affair with your husband in Toronto, and it's going to come out next week, Christmas.'"

The girl in question: Emily Goodhand, a 28-year-old that Dean met while filming "Chopped Canada" last year.

Watch the clip above to see how she confronted McDermott about the allegations.

Just last week, the first trailer for the upcoming Lifetime series gave us a look into one of the couple's extremely intense therapy sessions.

"I was out of control. Sex was an escape, just like drugs and alcohol," McDermott says in the clip.

"I can never give him enough sex, he's never going to be happy with just me," a tearful Tori adds.

"True Tori" premieres April 22 on Lifetime. Will you tune in?

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