Galleries of pictures can be found at L'essentiel, Tageblatt, L'Est Républicain, Belga, Sipa Press, AFP, Semana, Wort and L'Est Républicain.
From the paternal side of Christoph's family I have seen pictures of Archduke Rudolf and his wife Archduchess Helene; some of their children were present yesterday so I reckon they were also there today. Christoph's paternal grandmother Archduchess Yolande was also among the guests, as was his aunt Archduchess Constanza.
As was Princess Margaretha and her husband Prince Nikolaus of Liechtenstein as well as Prince Guillaume and Princess Sibilla with their youngest son Prince Jean.
The only non-direct family member I have see so far were Prince Philipp and Princess Isabelle of Liechtenstein, the brother of Prince Nikolaus and his wife.