THE SON of Norway’s crown princess had been arrested on suspicion of rape.

Marius Borg Hoiby, 27, was detained by police on Monday night in the latest scandal to rock the royal family.

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Hoiby – the son of Norwegian Crown Princess Mette-Marit – is accused of sexually assaulting “someone who is unconscious or otherwise unable to resist the act”, police said.

He was previously detained in August after allegedly attacking his ex-girlfriend.

The king was initially charged with bodily harm and damage to her apartment, before the charge was expanded to include another count of bodily harm and

Police arrested Hoiby again in September for violating a restraining order.

Officers then arrested Hoiby on Monday night after new information emerged during an ongoing investigation.

Prosecutor Andreas Kruszewski claims Hoiby sexually assaulted a 20-year-old woman in Oslo earlier this year.

Hoiby was in a car with the alleged victim in the August incident. when he was arrested by police shortly after 11:00 p.m. local time, according to police.

On Tuesday, police also said suspicions in the August incident now include domestic abuse.

Police said they have not yet decided whether he will be remanded in custody.

Hoiby was born in 1997 from a relationship prior to Mette-Marit’s 2001 marriage to Crown Prince Haakon, the heir apparent to the throne of Norway.

He and his half-siblings — Princess Ingrid Alexandra, 20, and Prince Sverre Magnus, 18 — were raised together by Mette-Marit and Haakon.

Unlike them, he has no official public role.

After his arrest in September, Aftenposten reported that Hoiby had been barred from his mother and stepfather’s home