Prince Joachim openly criticised his mother after she decided to strip his children of their royal titles last September - but he appeared to be all smiles when attending the glitzy party in Copenhagen.
Queen Margrethe’s grandson celebrated his special day with a royal gala and guests like Princesses Elisabeth, Estelle and Ingrid Alexandra – so what’s next for the teen?
Prince Christian of Denmark's 18th birthday gala ended with a mystery after a single heel was found following the celebrations at Christiansborg Palace