The secret is out! Tori Spelling has admitted to sleeping with her "Beverly, Hills 90210" co-star Jason Priestley. During her one-hour Lifetime special, "Tori Spelling: Celebrity Lie Detector," the 42-year-old actress said that she and Priestley had an off-screen summer fling.

"Half my friends don't even know this," Spelling shared while hooked up to a polygraph, before admitting that she had a relationship with Priestley, according to People.

"It was a summer fling, it was off-set, it was our version of, like, a summer romance, the '90210' version, and that was it. You know, we stayed great friends for the rest of the run, and beyond that, but yeah, we had that one summer fling," she added.

Spelling and Priestley's summer fling reportedly happened after the actress ended her relationship with Brian Austin Green, whom she also admitted to having a sexual relationship with.

"Brian and I were the youngest. We were 16," recalled Spelling, who's now married to Dean McDermott and has four children. "I remember the time I shook his hand. I had, like, [those feelings]. He teased me. He would tease me a lot. He would pull on my peach fuzz and he'd be like, 'Oh my gosh. You're like a little lamb chop. You're like my Chewbacca.'"

During her interrogation, Spelling, who played Donna Martin on the hit '90s series, also admitted to sharing a special kiss with Luke Perry on her 18th birthday. "It was like for a second, but it was like for a young girl that was everything. But no, we never had sex," she said, according to People.

Although Green and Perry have yet to respond to Tori's confession, Priestley was bombarded with tons of tweets from fans who asked him if Spelling's confession was true or false.

"I'm not getting into this... It's nobody's business... Either way..." Priestley tweeted. He later responded to a fan's question regarding his negative feelings toward the show, writing, "I'm only speaking with negativity about the Lifetime movie and Tori's lie detector... Nothing but love for 90210."

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