The blonde Mills, 18, wept as outgoing Miss World Kaiane Aldorino of Gibraltar placed the tiara on her head and led her to a diamond-shaped throne, in honour of the pageant's 60th anniversary.
Botswana's Emma Wareus was second, and Venezuela's Adriana Vasini placed third in the competition, held in the Chinese resort town of Sanya on Hainan island.
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