He's Kate Middleton's knight in shining armour.
"There is a right to privacy, whether you are famous or not famous," Travolta said.
Travolta, who recently faced his own tabloid scandals, compared Kate's situation to the hounding of Princess Diana.
"I feel that anyone being invaded at that level is unfortunate, and there should be a law," said Travolta.
Travolta famously danced with Diana at the White House in 1985.
"Because of the Internet, the level of invasion is so high. I could arguably say it's the worst time to be famous," said Travolta.