Actress Tori Spelling revealed during her one-hour Lifetime special, "Tori Spelling: Celebrity Lie Detector," on Saturday which of her "Beverly Hills, 90210" co-stars she had sex with.

Spelling, 42, confessed to sleeping with two of her former co-stars: Brian Austin Green and Jason Priestley.

Green played David Silver, the boyfriend of Spelling's "Beverly Hills, 90210" character Donna Martin. The couple famously dated in real life in the early 1990s as well.

"He was a little bit of my everything," Spelling revealed. "We grew up together. I think I was always in love with Brian."

After Spelling discusses Green in the video clip from Saturday's show, host Louise Roe presses her for more information.

"Was there anyone else from the original cast, I'm just going to say it, that you had sex with?" Roe asks.

"Yes, but I'm not going to tell you who it is," Spelling says, appearing anxious at being wired to the lie-detecting device. "I'm not telling you. I'm trying to do my lie detector poker face."

Roe says, "It was Jason Priestley."

"Yeah," Spelling replies. "It was a summer fling. It was off-set. It was our version of a summer romance. The 90210 version. And that was it, and we stayed great friends for the rest of the run and beyond that. We had that one summer fling."

On Sunday, a fan contacted Priestley on Twitter, asking if Spelling was telling the truth.

"I'm not getting into this... It's nobody's business... Either way," he tweeted on Sunday.

Priestley tweeted that he is "only speaking with negativity about the Lifetime movie and Tori's lie detector," though he has "Nothing but love for 90210."

"I'm actually feeling a little nostalgic today... That show was quite an experience... I owe it a lot," he added, referring to "Beverly Hills, 90210's" 25th anniversary celebrated on Sunday.