Hollywood met royalty for the iconic wedding in 1956 - here's all we know about the stunning celebration...
#1 Hollywood star Grace Kelly and Prince Rainier III of Monaco first met at the Cannes Film Festival in April 1955; Grace was dating French actor Jean-Pierre Aumont at the time. The couple met again and fell in love; after three days spent with Grace and her family, Rainier proposed.
#2 The couple were married on April 18 1956, in a ceremony watched by 30 million people across the globe. (A remarkable achievement considering owning a TV wasn't common at the time!) Thousands of reporters swarmed to Monaco, with the wedding reportedly receiving more press coverage than the Second World War.
#3 When Grace - who had sailed by boat, accompanied by her family, bridesmaids and poodle! - arrived in Monaco, over 20,000 people lined the streets to greet her.
#4 The couple were officially married in a civil ceremony on April 18 1956, with their closest family and friends present. The ceremony was held at the Prince's palace - and the whole property was redecorated ahead of the celebration.
#5 The following day, an extravagant religious ceremony took place at Monaco's Cathedral, attended by 600 guests, including royalty, and various heads of state from across the globe. An assortment of Hollywood stars also made the journey to attend the glorious nuptials: Cary Grant, David Niven and Ava Gardener were all on the seating plan.
#6 Now - on to that wedding dress! As the couple had two ceremonies, it was only fitting that Grace had two divine wedding gowns. Both were designed by Helen Rose, MGM Studios' costume designer, and was a gift to the bride from MGM. The second dress has gone on to inspire endless bridal gowns, including those worn by Kate Middleton and Nicky Hilton.
#7 The first dress? A pale pink taffeta frock, which Grace matched with kid gloves and a Juliet cap. The second: that iconic lace creation, which featured 25 yards of silk taffeta, 100 years of silk net and 125-year-old Brussels lace. The Juliet cap was embellished with seed pearls and orange blossoms, whilst a 90-yard tulle veil completed the look. It took a team of 36 seamstresses three weeks to construct; Grace paired the finished look with a bouquet of Lilies of the Valley and a small Bible.
#8 Grace's sister Peggy was Matron of Honour, whilst the six bridesmaids wore yellow dresses, designed by Priscilla of Boston. Four flower girls and two page boys - all in white - completed the bridal party entourage.
#9 The newlyweds cut into a stunning six-tier fruit wedding cake, whilst the Prince cut into using his ceremonial sword.
#10 Speaking in 2016 about his parents' wedding and reflecting on its cultural significance, Prince Albert of Monaco told PEOPLE: "For us, it was – and you'll have to ask my sisters – for us it was our parents getting married. But what it's meant for Monaco, for people around the world, and, how their story continues to fascinate people, that's something unimaginable".