Glittering tiaras and exquisite ball gowns: All the pictures from King Harold and Queen Sonja's birthday celebration

Queen Sonja and King Harald’s joint 80th birthday celebration was a royal affair to remember. <p>A parade of royals from across Europe flocked to Norway for the two-day festivities, which kicked off with an ultra-glam gala dinner at the palace on May 9. </p> On the second day of the birthday affair, the royal couples braved the rain to attend a banquet at The Opera House in downtown Oslo. The weather did little to damper the spirits of the fashionable set, who swapped their tiaras and ball gowns for less formal, yet still fancy, frocks. <p>Click through for all the best photos from the royalty-studded celebrations. </p> Photo: Thomas Brun/Norway Royal Court via Getty Images
Queen Maxima shined in gold and purple as she arrived to the Opera House with husband King Willem-Alexander. <p>Photo: Patrick van Katwijk/Getty Images
Mom-to-be Sofia looked lovely in a tiered white gown alongside her husband Prince Carl Philip. <p>Photo: Patrick van Katwijk/Getty Images
Princess Mette-Marit and Prince Haakon of Norway looked picture perfect in matching navy ensembles. <p>Photo: Patrick van Katwijk/Getty Images
Princess Victoria slipped into an elegant floral gown for the reception. <p>Photo: Patrick van Katwijk/Getty Images
King Philippe and Queen Mathilde of Belgium <p>Photo: Patrick van Katwijk/Getty Images
Crown Prince Pavlos and Crown Princess Marie Chantal Greece <p>Photo: Patrick van Katwijk/Getty Images
On day one of the celebration, the King and Queen were joined by their family on the balcony ahead of the banquet dinner held at the palace. <p>The monarch's son Prince Haakon and daughter-in-law Princess Mette-Marit sang along with well-wishers and their relatives to the country’s birthday song, "Hurra for Deg." </p> During the melody, Haakon and Mette-Merit danced out the lyrics of the song that states: “We all stand around you in a ring / And look, now we’ll march / Bow, nod, curtsy, we turn around / Dance for you and hop and skip and jump / Wishing you from the heart all good things!” <p>Photo: HAAKON MOSVOLD LARSEN/AFP/Getty Images
The king was visibly moved by the crowd's love and support. <p>Photo: Getty Images
Norway's Princess Mette-Marit and Prince Haakon were all smiles on the balcony. <p>Photo: Getty Images
Despite the chilly temperature in Oslo, King Carl Gustaf and Queen Silvia of Sweden, King Willem-Alexander and Queen Maxima of The Netherlands and Princess Astrid of Norway joined the king and queen on the balcony of the Royal Palace. <p>Photo: Patrick van Katwijk/Getty Images
Maxima wore the Royal Family's stunning Dutch Sapphire Tiara. <p>Photo: Getty Images
Crown Princess Victoria of Sweden and her husband Prince Daniel. <p>Photo: JON OLAV NESVOLD/AFP/Getty Images
The belle of the ball and the man of the hour, Queen Sonja and King Harald made their way into the banquet arm-in-arm. <p>Photo: HAAKON MOSVOLD LARSEN/AFP/Getty Images
Sophie, Countess of Wessex donned an emerald green gown as she represented the UK at the joint celebration in Oslo, Norway. <p>Photo: HAAKON MOSVOLD LARSEN/AFP/Getty Images
Princess Sofia showed off her baby bump in an Oscar de la Renta gown that she previously wore to the 2015 Nobel Prize Banquet. The Swedish royal, who attended with her husband Prince Carl Philip, in-laws King Carl Gustaf, Queen Silvia, Crown Princess Victoria and Prince Daniel, was escorted into the banquet along with Princess Tatiana of Greece (L). <p>Photo: HAAKON MOSVOLD LARSEN/AFP/Getty Images
Meanwhile, her husband Prince Carl Philip walked into the dinner with Belgium's Queen Mathilde. <p>Photo: HAAKON MOSVOLD LARSEN/AFP/Getty Images
Prince Albert of Monaco escorted Crown Princess Mary to the birthday dinner. His wife Princess Charlene stayed home to care for their twins Prince Jacques and Princess Gabriella. <p>Photo: HAAKON MOSVOLD LARSEN/AFP/Getty Images
Queen Margrethe of Denmark and Prince Haakon of Norway. <p>Photo: Getty Images
Princess Mette-Marit of Norway was escorted by King Carl Gustaf of Sweden. <p>Photo: Getty Images
Crown Princess Marie-Chantal of Greece made a floral statement donning a ballgown to the celebration. <p>Photo: HAAKON MOSVOLD LARSEN/AFP/Getty Images
Inside the dinner, Crown Prince Haakon, who was seated next to Queen Silvia, underwent a dramatic transformation about halfway through. The King and Queen’s son shaved his beard “as part of the entertainment during the gala dinner.” <p>Photo: HEIKO JUNGE/AFP/Getty Images
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