Ari Behn, who was previously married to Princess Märtha Louise of Norway, has claimed that Spacey propositioned him at the prestigious event.
A former member of Norway's royal family claims Kevin Spacey grabbed his genitals during a Nobel Peace Prize reception ten years ago.
"I got more than I bargained for", he added.
Since then dozens more people, including former and current House of Cards employees, have come forward with sexual misconduct allegations against the actor.
Behn separated from Princess Martha Louise, the only daughter of King Harald V, last year (16) after 14 years of marriage.
Legend of Zelda: Breath of the Wild's Champions' Ballad DLC Available Tonight
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Allegations against Spacey first surfaced earlier this year when fellow actor Anthony Rapp accused him of making sexual advances when Rapp was 14-year-old.
Rather than deny the incident, which was alleged to have been in 1986, Spacey said while he didn't remember, he apologised anyway. "But if I did behave then as he describes, I owe him the sincerest apology for what would have been deeply inappropriate drunken behavior, and I am sorry for the feelings he describes having carried with him all these years". In a statement Spacey also revealed he was gay.
He continued, "This story has encouraged me to address other things about my life".
What do you think of the shock allegations against Kevin Spacey?
The consequences for Spacey have been catastrophic to his career and reputation, including the humiliation of being summarily fired from House of Cards and seeing his role in a soon-to-open movie re-shot with another actor.