Kylie Minogue has branded the photographer who took topless photos of the Duchess of Cambridge "a peeping Tom".
Speaking at the premiere of her new French film Holy Motors, the singer condemned the treatment of the Duchess as "awful" and told Sky News a line had been crossed.
"It's always crossing the line, if you're on private property you should be able to do whatever you like - that should be everyone's right.
"For me, that story and any like it, I don't see why that's not considered to be like a peeping Tom and that's creepy, it's awful."
Holy Motors also stars Eva Mendes and Denis Levant - whose role involves the actor being driven around Paris and changing character at every stop.
Kylie's part is small but arresting. She appears towards the end of the film as a tragic femme fatale.
She said it was not a hard decision to be part of such an eccentric project.
"It was quite beautiful how it came about. I have a mutual friend with the director. It was one of those things that fell from heaven.
"It seemed like the most beautiful opportunity. I wanted to go back into acting for a long time.
"I've made some very bad decisions and this was a good one. I'm a sucker for a new experience".
Kylie is celebrating 25 years in the business - a milestone which she said has been a time for both reflection and celebration.
"It's been a big year ... the way I describe it is like moving house. If you say you're packing up, you get stopped at certain moments, everything has a memory.
"This year has been quite reflective, it's been emotional with the celebrating but quite hard work."