The world’s most high profile fashion designers clamour to dress them.
But judging by recent photos, it seems the European princesses have another source of style inspiration – each other.
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When Crown Princess Letizia of Spain paired a fire engine red dress with nude accessories, it left many wondering if she had been taking fashion tips from the sartorially savvy Duchess of Cambridge.
Norway's Crown Princess Mette-Marit is another future queen whose taste coincides with that of her peers.
At the Swedish royal wedding in 2010 she stepped out in an ice blue floor-length showstopper that was strikingly similar to one worn by the bride's sister, Princess Madeleine.
All the news as Duchess Kate's due date draws close...