I guess they didn't like what they saw in the pictures and don't think they reflect how the real thing looks.
Here is the official response:
"Members of the Royal Family, as well as actors, footballers and top models are all familiar with the sensation of being caught in uncompromising situations, and now MINI is the latest victim. Absolutely unaware and without make-up, the youngest member of our family was caught by sensationalist photographers in a highly private moment.
Those extra long telephoto lenses have the devastating ability to negatively distort all surfaces, lines and angles."