Ari Behn, who was married to Princess Märtha Louise of Norway before their divorce a year ago, told Norwegian radio station P4 that Spacey proposed the pair go outside.
Behn, who was married to Princess Martha Louise at the time, claims Spacey grabbed his testicles under the table after asking if he wanted to smoke outside.
Danish-Norwegian writer Ari Behn, formerly married to Princess Märtha Louise and father of three, on Thursday became the 16th man to accuse Spacey of sexual misconduct in the wake of a flood of allegations that have helped fell prominent men in entertainment, politics, media, business and fashion over the last two months.
"He was sitting right next to me", Behn reportedly told Norwegian radio station P4, according to The Sun. "After five minutes, he says 'Hey, let's go out and have a cigarette, ' and then he touched me right on the balls under the table".
"I got more than I bargained for", he joked to the radio host.
Ari divorced Princess Märtha Louise of Norway a year ago after marrying in 2002.
It appears Kevin Spacey groped just about anyone, anywhere.
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It comes after Buzzfeed first exposed sexual assault claims against Spacey in an interview with actor Anthony Rapp, who accused the actor of forcing himself on him when he was only 14 years old.
In the wake of the scandal, Netflix has made a decision to remove Spacey from the upcoming season of "House of Cards".
The former Norwegian royal is just one of at least 15 men who have come forward with allegations against Spacey.
In a statement, Spacey said he did not remember the alleged encounter but apologised if such "drunken behaviour" had occurred.
CNN also reported that eight current or former House of Cards workers claim that Spacey made the production a "toxic" workplace.
Spacey has not been arrested or charged with any crime.