From Miss Mertens' photostream on flickr.
Here is another view of the Duchess of Vendôme wearing the same dress as in the last three photos.
Keywords: 1910, Henrietta of Vendôme, Wettin family, Bourbon family, Princess, Duchess, French, straight coiffure, tiara, crescent neckline, elbow length close sleeves, no waistline, tight skirt, over-skirt, necklace, earrings, bracelets, fan