I was able to get the latest issue of Point de Vue, which includes a feature on the wedding of Archduke Imre of Austria and Kathleen Walker. The photos were provided by Luxpress. Along with the already seen photos from the wedding and the reception at the Ritz-Carlton, the article also includes photos from the wedding ball. I am not sure if the ball was held before the wedding or after the reception.
The bride wore a royal-cum-sapphire-blue gown as she danced with her husband. The article also showed the groom's parents, Archduke Christian and Archduchess Marie Astrid dancing, and a third photo of Prince Guillaume and Princess Sibilla of Luxembourg in formal attire at the ball.
The article is not online.