Today sees King Carl Gustaf's Golden Jubilee celebration take place in Stockholm, with attendees including Crown Princess Victoria and Princess Sofia of Sweden looking sensational for the milestone occasion.
The event is all the more special for King Carl, as he becomes the first monarch in the country's history to celebrate a Golden Jubilee - plus, he is currently the second longest-reigning living monarch in Europe.
Friday sees a church service take place at the Royal Palace, followed by a televised speech from King Carl Gustaf, while Thursday's agenda included an opera performance at Drottningholm Palace outside Stockholm followed by a private dinner.
Read on for all the best-dressed European royals attending the special occasion.
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Princess Sofia
Princess Sofia of Sweden is a vision in yellow for her father-in-law's celebration, wearing head-to-toe lemon.
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Queen Margrethe II and Queen Anne-Marie
Queen Margrethe II of Denmark and Queen Anne-Marie of Greece looked elegant in their jubilee outfits, arriving together for the special occasion. Margarethe opted for a pink paisley print pleated frock with a Barbie pink jacket layered over the top, while Anne-Marie wore a regal navy coatdress with a shawl draped over her arms.
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Queen Silvia
With her husband the man of the hour, it was no surprise that Queen Silvia of Sweden made a special effort with her outfit, wearing a powder blue suit with sensible heels.
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Princess Madeleine
Princess Madeleine of Sweden followed in her mother's stylish footsteps, also opting for a pale blue outfit for her father's big day.
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Crown Princess Victoria
Crown Princess Victoria didn't get the baby blue memo but looked sensational in her floral dress, accentuating the purple accents of her dress with her chunky headband.
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Princess Estelle
Crown Princess Victoria's daughter, Princess Estelle, looked super cute in her blue skirt suit, taking her aunt and grandmother's advice and wearing blue for the special day.
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Estelle was pictured grinning from ear to ear as her mother fixed her collar during their balcony appearance as the King oversaw the Changing of the Guard.
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Prince Oscar
Victoria's mum duties didn't end there, as she also made sure her son Prince Oscar looked picture-perfect. He was his father Prince Daniel's mini-me in a smart suit and blue tie, while Victoria ensured his hair was swept back away from his face.
Stand by for more photos as they land, and in the meantime, brush up on your European royals below...
Meet the Kings and Queens of Europe 