As someone who has also sunbathed topless on a French beach, I too feel so very sorry for Kate and Wills.
If I put myself in their place, and I am on a 640acre estate with my husband, having a long awaited holiday and the nearest public road is a kilometre away. It's hot and I want to sunbath topless with the only person to see me being my husband. Then, a couple of weeks later during a public visit to Singapore.....
...pictures of my topless self are splashed all over a french newspaper and I am horrified to think that men will be mentally undressing me wherever I go from now on, I would be mortified.
It's not really a question of her being topless, as others have said, she's no different from any other woman in that respect but she chose to do it in the, what she thought was, the 'privacy' of the location. It took a supertelescopic lens to get those photographs.
If the photographer or the editor of the magazine has a partner, how would they like a photo of them being published when they thought they were in private. Now there's an idea.