

Her Royal Highness Doña María de las Mercedes de Orléans y Borbón, Infanta of Spain and Princess of Orléans in 1877.
In 1878 the Infanta married her cousin Alfonso XII against Alfonso’s mother and the government’s wishes, who wanted an alliance with an European princess. 17 years old on her wedding day, she became the youngest Queen consort of Spain and the first and only one who has been born in Spain. She died six months later, two days after her 18th birthday, on June 26 1878 at the Royal Palace in Madrid.
A town was named, in memoriam, Reina Mercedes (Queen Mercedes), in the province of Isabela (named after her aunt Isabel II) in the Philippines, itself named (Las Filipinas) for King Felipe II.

Prince Alvaro of Orleans-Bourbon
Eldest son of the Infante Alfonso and the Infanta Beatriz (Baby Bee), grandson of the Infanta Eulalia.
(via antiqueroyals)

Miniature of the Infanta Luisa Fernanda (1832-1897), Duchess of Montpensier in the British Royal Collection.
Leopold I, King of the Belgians, reported to Queen Victoria in 1846 that: ‘The Infanta is evidently good looking … Her eyes seem … very lovely and she has fine teeth and hair. She is also very graceful … rather tall already and likely still to grow’ (RA VIC/Y 73/14). She had matured by the time Queen Victoria saw her during her visit to England from 14 June to 2 July 1852: ‘She is very Spanish looking, and there is much charm & beauty about her face, & manner – tho’ she is a good deal altered & looks older than she is. She is very amiable & gentle & ready to do anything & pleased with everything’ (RA VIC/Y 97/20). The Queen was delighted when she wore a mantilla, as in the present enamel: ‘The Montpensiers came to see us … Fernanda looked very handsome in a Spanish Mantilla w h. she put on on purpose for me’ (RA VIC/Y 97/21).
Luisa Fernanda, daughter of Fernando VII of Spain, and of Maria Cristina of the Two-Sicilies, daughter of King Francis I of the Two Sicilies, married in 1846 Antoine, duc de Montpensier, fifth son of Louis-Philippe, King of the French. They had four sons and five daughters.
Signed, dated and inscribed on the counter-enamel in black paint: Infanta Louisa Ferdinanda / Duchess of Montpensier / Simpson after F. Winterhalter / 1849
(Source: royalcollection.org.uk)

Marie Louise of Orléans, Queen of Spain, lying in state in the Royal Alcazar of Madrid.Sebastián Muñoz, 1689.

María de las Mercedes de Orléans y Borbón (24 June 1860 – 26 June 1878), Infanta of Spain, Princess of Orléans and Queen of Spain as King Alfonso XII first wife.

Pss Adelaide d Orleans with a young Prince of Asturias and Phillipe of Belgium. 90s.
Ps: Im not sure but if i remember well, Adelaide dated Felipe for a while. Im not sure tho.

The duke and duchess of Calabria (nee Pss Anne of France). 1960s.
Curious fact of this couple: They, as other royals such as Anne Marie of Denmark and Constantinos of Greece, fell in love in Pss Sophie of Greece marriage with Don Juan Carlos, prince of Asturias, 1962. Diana was one of Sofia´s bridesmaid.
I think you meant that Anne was a bridesmaid, not her sister ;)

Infanta Beatriz, Duchess of Galliera