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If you'd only read your Daily Mail or Tatler, you'd know to find Princess Gabriella in Monaco.

As far as reigning-house europeans go:

  Princess Elisabeth
  Princess Eléonore
  Princess Isabella
  Princess Josephine
  Princess Marie-Caroline
  Princess Amalia
  Princess Gabriella
  Princess Catharina-Amalia
  Princess Alexia
  Princess Ariane
  Princess Ingrid
  Infanta Leonor
  Infanta Sofía
  Princess Estelle
  Princess Adrienne
  Princess Charlotte
  Princess Lilibet

At press time, Princess Peach was in another castle.

Lagniappe: https://www.youtube.com/watch?v=-TQmo5TvZQY