A Norwegian royal has claimed Kevin Spacey once groped his testicles.

Ari Behn has alleged he was fondled by the Hollywood actor during an event in Oslo ten years ago, after Spacey had just finished hosting a Nobel Peace Prize bash.

The royal recalled: ''He was sitting right next to me. After five minutes, he says 'Hey, let's go out and have a cigarette' - and then he takes me under the table in the middle of my balls.

''I got more than I bargained for.''

Ari, who is the husband of Princess Martha Louise, admitted to being taken back by Spacey's behaviour.

He explained to a radio station that he responded to the actor's alleged advances by saying: ''Eh? Maybe later.''

Spacey's career has been thrown into turmoil in recent months following a string of accusations made against the award-winning actor.

The allegations began back in October, when fellow actor Anthony Rapp claimed Spacey made a sexual advance towards him when he was just 14 years old in 1986.

Spacey responded to the allegation in a lengthy statement in which he apologised for his behaviour, and also revealed he is now living as a gay man.

He said at the time: ''I have a lot of respect and admiration for Anthony Rapp as an actor. I'm beyond horrified to hear his story. I honestly do not remember the encounter, it would have been over 30 years ago. 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 described having carried with him all these years.

''This story has encouraged me to address other things in my life. I know that there are stories out there about me and that some have been fueled by the fact that I have been so protective of my privacy. As those closest to me know, in my life I have had relationships with both men and women. I have loved and had romantic encounters with men throughout my life, and I choose now to live as a gay man. I want to deal with this honestly and openly and that starts with examining my own behavior. (sic)''