Gossip magazines have published topless pictures of Prince William's wife taken during a private holiday.
Travolta, who has faced unwelcome scrutiny of his own private life, told the BBC that it is the "worst time to be famous."
"There is a right to privacy whether you're famous or not famous, and I feel that anyone being invaded at that level is unfortunate and there should be a law, no one would like that," he said in an interview broadcast Friday.
Travolta plays a corrupt cop in Oliver Stone's drug-war film "Savages," which opens in Britain on Friday.
It's his first film since 2010. Recently he has been in the headlines for his private life, including a discredited – but widely reported – lawsuit claiming he had groped two masseurs.
Travolta, who has been