United Kingdom, Oct. 6 -- Michael Douglas has revealed how everyone "missed" his secret romance with Jeanne Tripplehorn.

The 82-year-old actor has confirmed he had a secret romance while filming Basic Instinct while he was separated from then-wife Diandra Luker, and he recalled that all the speculation about him and Sharon Stone meant no one noticed what was happening with his other co-star.

In his new memoir One Helluva Ride, he wrote: "They were so focused on a possible relationship between Sharon and me, they missed the real relationship happening between me and Jeanne."

Michael noted that the pair "took great paints to hide" their romance "from the cast and crew".

He added: "[We] spent so many hours together, talking, really getti...