Happy Birthday to Prince William! The Duke of Cambridge turns 40 on June 21.
In celebration of the big milestone, ET Canada takes a look back at 10 moments that made the second in line to the throne a true prince of hearts.
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Two-year-old William makes an adorable appearance on the royal balcony during the Trooping the Colour ceremony in June 1984.
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A young William and his little brother Harry have fun riding a log flume ride with their beloved late mother, Princess Diana.
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The caring prince helps his great-grandmother, the Queen Mother, during celebrations for her 99th birthday in August 1999.
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In July 2013, William holds his newborn son Prince George outside the Lindo Wing of St Mary's Hospital in London.
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William proves he's a natural with children while meeting some tiny Canucks during his visit to Victoria in 2016.
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What would a duke be without his duchess?
William and Kate Middleton share a sweet moment as he gives her a flower outside City Hall in Bradford in January 2020.
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William lets his inner child out to play while messing about with his three children, George, Charlotte and Louis, in photos taken by Kate Middleton ahead of his 38th birthday.
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William gets in on the action while meeting the Jamaican Bobsleigh team in Trench Town during the Caribbean Royal Tour in March 2022.
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William makes some funny faces as he meets pupils during a visit to St. John's Primary School, Port Glasgow in May 2022.
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Viewers around the world watch as William and Prince George belt out "Sweet Caroline" while watching Rod Stewart perform at the Platinum Jubilee concert in honour of Queen Elizabeth.