The event was held in Zarzuela Palace to honour Michelle Bachelet, the visiting President of Chile.
|Casa de S.M. el Rey Twitter Feed|
Letizia selected the Spanish Floral Tiara for the evening. The tiara's history goes back to 1962 when General Franco gave it to Princess Sophia of Greece and Denmark on behalf of the Spanish people to mark her marriage to Juan Carlos I of Spain. Queen Sofia has worn it countless times over the years and in recent years it has become Letizia's second favourite.
It's a very pretty tiara set in gold and silver in a floral motif. It's actually convertible and makes for a divinely striking necklace too.
The Queen chose a delicate black lace gown by Caroline Herrera for the occasion.
The short-sleeve, tiered-lace evening gown is fitted through the hip and features a high, round neckline and short sleeves. Made in Italy, it is currently available at Neiman Marcus for just under £4,000.
Dramatic make-up and simple diamond earrings completed what is, in my opinion, one of Letizia's finest looks.
The King and Queen of the Netherlands are on a state visit to Japan, and as you know, we can always rely upon Max to deliver in the sparkle stakes.
Yesterday evening, the Emperor and Empress held a state banquet in honour of the visit and for her first state visit as Queen to another monarchy she chose a tiara which was one of Beatrix's favourites - the Württemberg Ornate Pearl Tiara.
|Dutch Monarchy Official Website|
Elsewhere in Europe, the royals have been showcasing a selection of stylish evening looks at various events. Crown Princess Mary of Denmark looked elegant at a gala for the American Chamber of Commerce in Copenhagen.
The Crown Princess selected a floral-print skirt by Australian designer Jayson Brunsdon with an off-the-shoulder top and gorgeous blue earrings.
Queen Mathile of Belgium wore a gorgeous midnight blue velvet off-the-shoulder gown for a reception with Canada's Governor-General David Johnston. This gown is very Princess Diana-esque and like the late Princess, Mathilde has the stature to pull it off.
Last but certainly not least, Crown Princess Victoria of Sweden joined other members of the royal family at a dinner for members of parliament at the Royal Palace in Stockholm. Victoria chose a flowing teal gown with delicate embellishment and Oscar de la Renta earrings (perhaps in memory of the late designer).
Victoria also wore a glamorous pink gown for a formal gathering of the Royal Swedish Academy of Engineering Sciences.
Let us know which look was your favourite in the comments section. :)