It was a low-profile wedding, attended only by his brother Dimitri.
His mother Pss Barbara was recovering from an accident in Liechtenstein and could not attend.
On another note, Pss Helena of Yu had her religious wedding with Stanislas Fougeronon Sep.15.
The couple had their civil wedding in March.
Helene's divorce from 1st husband Thierry Gaubert was not a "peaceful" one, with the princess accusing her husband of darkish economic practices, and the family apparently is broken.
The 2 girls, Anastasia and Milena stood by their father and were not present neither at the civil, nor at the religious wedding, only their brother Leopold attended.