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Prince Harry and US girlfriend Meghan Markle finally took their romance public late last month following a year of dating.

First, the pair confidently walked hand-in-hand into the Invictus Games - the international multisport Paralympic event he founded - wheelchair tennis finals.

Then they were seen cuddling up to each other at the closing games ceremony - with the royal even pictured planting a tender kiss on the 36-year-old Suits star's cheek.

In contrast, the Duke and Duchess of Cambridge are rarely, if ever, openly affectionate when carrying out their public engagements, which prompts the question - is there a royal rule on refraining from PDAs?