Kate Middleton – Britain's beloved Princess of Wales – may be facing a secret health crisis and losing her luscious locks due to grueling medical treatments just one year after announcing she was in remission, RadarOnline.com can reveal

Middleton recently appeared beside heir to the throne Prince William , her hubby, at London 's Natural History Museum. But concerned witnesses say there was nothing natural about her unusually voluminous blond 'do.

"It looks like a wig. She's known for her long, lustrous, full, vibrant hair, and it is likely thinning due to all the treatment she's undergone," beauty expert Blake Johnson told RadarOnline.com . Article continues below advertisement

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