United Kingdom, May 10 -- Brian Austin Green "doesn't remember" hooking up with Tori Spelling.

The 51-year-old actor starred alongside Tori, also 51, on the hit 1990s series 'Beverly Hills, 90210' and she recently reminded him that they had a sexual experience together as teenagers, but he had no recollection of it.

Speaking during their upcoming reunion on 'The $100,000 Pyramid' - which will air on May 11 - she explained: "Yes, recently on my podcast 'misSPELLING', we did talk about when we were young teenagers and we hooked up, and he couldn't remember exactly the first time we hooked up.

Brian replied: "I don't remember that story at all, which is crazy."

Tori joked: "Which means I was really memorable."

The actress previously rev...