King Harald is participating in the World Sailing Championships in Toronto (Royal House of Norway)
Crown Princess Mary took part in the Baltic Sea Challenge (Daily Mail)
Have you heard that the Countess of Wessex is taking up a Duke of Edinburgh challenge (raising funds for charity in honour of the Duke of Edinburgh Award’s 60th anniversary) that involves many, many hours wearing a bike helmet?
While not exactly a sport… Princess Camilla of of Bourbon Two Sicilies was spotted hat shopping in St. Tropez back in early July (Pure People)
In early August, she was also spotted out on the town in some snazzy headpieces (Pure People)
Lovely new photo of Prince Carl Philip, Princes Sofia and Prince Alexander (Svenskdam)
Photos from BestImage
Royal Hats 
I believe you mean Carl Philip, not Carl Christian.
Yes… I don’t know where that came from! Correction made.
Photographers must love the Duchess of Castro. Not only does she dress flamboyantly, but she always looks directly at the camera and strikes a pose. Thank you for the extensive retrospective.
Nice summaries of Princess Camilla, HatQueen and Ivy. The princess certainly seems to have fun with fashion!
Who is Princess Camilla? Never heard of her but she looks like a scream!
The daughter of a wealthy Italian industrialist, Camilla Crociani was a well educated, multi-lingual equestrienne (and heiress) when she married Prince Carlo of Bourbon-Two Sicilies in 1998. He is an Italian prince (read a summary about the complex House of Bourbon-Two Sicilies here or a longer explanation here) raised in France- they now live in Monaco with their two daughters. The couple are close friends with the Crown Prince Frederik and Princess Mary of Denmark and Prince Albert of Monaco and are often included in European royal events. While Princess Camilla seems to do a lot of charity work, she’s most famous for her colourful and somewhat flamboyant personal style.
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I remember her now. She dresses more Hollywood than princessy and she looks great!