Kate Middleton “is prepared to fight” for the crown, and it may be the very reason she has gotten so “close” to King Charles III.While assisting King Charles, 75, and Queen Camilla, 76, in hosting over 500 members of the diplomatic corps at Buckingham Palace’s annual reception on Dec. 5, the 41-year-old Princess of Wales dazzled in the historic Lover’s Knot tiara, a favorite of Princess Diana’s, and effortlessly hobnobbed with all of the dignitaries in attendance.“She hugely enjoyed that evening and looked really at home,” a royal source shared with People.