The guest list included King Carl Gustaf and Queen Silvia of Sweden, who attended dressed as Zorro and Marilyn Monroe, hellomagazine.com reported. There were also some near-royals such as the Duchess of York, ex-wife of Prince Andrew of Britain, and Princess Chantal, ex-wife of Prince Ernst of Hanover.
Chantal reportedly wore a startling red cowgirl outfit that featured a blue hat, red boots and a satin bustier.
Von Bismarck, great-granddaughter of the legendary German chancellor Otto von Bismarck, is known for her parties. She celebrated her 50th birthday with a Caribbean-themed party at the family castle.