Kate Middleton has shared the email she sent to judges of the "Hold Still" photography competition after choosing the final 100 portraits.At the end of the email, the Duchess of Cambridge signed off simply as "C" for Catherine."Hold Still" has been run in partnership with the National Portrait Gallery, and hopes to capture the impact of the COVID-19 pandemic on people throughout the United Kingdom.While it's no secret that the Duchess of Cambridge's first name is Catherine, fans might be