Cindy Crawford has revealed she was 'so intimidated' when she met Princess Diana.The 54-year-old supermodel met the late Princess of Wales and her then 16-year-old son Prince William at Kensington Palace in London.On a YouTube live chat with Naomi Campbell on Monday, Cindy explained: 'I was so intimidated meeting Princess Diana and being at Kensington Palace and just how completely down-to-earth she was because there's so much protocol I guess, and not being English, I don't understand some of it.' Royal encounter: Cindy Crawford has revealed she was 'so intimidated' when she met Princess Diana at her home Kensington Palace but found her to be 'down-to-earth' and 'humble'Cindy added, during No Filter with Naomi, that she loved how 'humble'.