King Philippe and Queen Mathilde of Belgium Grand Duke Henri and Grand Duchesse Maria Teresa of Luxembourg have reunited for a gala dinner at the Royal Castle of Laeken – the official residence of Belgium's royal family.
The royals united in Brussels for the state visit and lavish dinner, decked out in their finest jewels and tiaras.
Read on to see all of the glamorous moments of the evening. 
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King Philippe and Queen Mathilde of Belgium
King Philippe and Queen Mathilde of Belgium are currently hosting their royal visitors.
Philippe wore his military regalia, finished with the golden sash, the Order of the Golden Lion of the House of Nassau.
The sash is finished with blue edges, and it is the highest chivalric order awarded to royalty and heads of state.
Queen Mathilde of Belgium
The mother-of-four wore a sparkling icy blue gown with a sweetheart neckline and royal jewels.
Her look was complete with the Nine Provinces Tiara, which dates back to 1926.
In true royal fashion, her sash featured the Order of the Gold Lion of the House of Nassau; this honour dates back to 1858.
Grand Duchesse Maria Teresa of Luxembourg
Grand Duchesse Maria Teresa of Luxembourg arrived for the gala dinner at the Royal Castle of Laeken with her husband, Grand Duke Henri.
The pair are in Belgium for a three-day visit.
The duchess wore an eye-catching sleeveless gown and a pink shawl.
She wore a collection of jewels connected to her late mother-in-law, Grand Duchess Josephine-Charlotte.
Grand Duchesse Maria wore the famous Belgian Scroll Tiara and matching aquamarine jewellery.
Grand Duke Henri
Grand Duke Henri of Luxembourg wore his military regalia for the banquet.
Like his wife, he wore the insignia of Belgium's Order of Leopold, the magenta sash.
It is one of Belgium's national honorary orders of knighthood and is named after its founder, King Leopold I.
All four royals posed a picture together.
Key Luxembourg officials, including Prime Minister Luc Frieden and the Minister of Finance Gilles Roth, also joined them for the event.
This trip hopes to highlight "new areas of cooperation," according to the Luxembourg Government.
Queen Mathilde of Belgium and Grand Duchesse Maria Teresa of Luxembourg also wore brooches representing their respective countries.
Maria's brooch is a Luxembourgish royal treasure. It is shaped like a rose and is one of at least three the Nassau family collected in the 1950s.
"This is the second State visit to Belgium by TRH the Grand Duke and Grand Duchess," a statement on the site read.
"Reflecting the excellent relations between Luxembourg and Belgium, who are close neighbours united by strong historical, political, socio-economic and cultural ties."
King Philippe of Belgium and Grand Duke Henri of Luxembourg shared a toast during the gala dinner.
King Philippe's father, King Albert II, and Henri's mother, Grand Duchess Josephine, were brother and sister, making them cousins.
The pair were born a day apart and have historically been good friends.
Queen Mathilde and Grand Duke Henri also shared a toast at the event, sipping from small crystal glasses.
The European royals paused for a photo, surrounded by eye-catching floral arrangements and decadent decorations.
They were accompanied by several state officials and guests.