They've been married for 11 years, and in that time Prince William and Kate Middleton have rarely been seen indulging in public displays of affection.
Unlike Meghan Markle and Prince Harry, who openly hold hands wherever they go, Kate and William prefer to keep a distance, limiting contact to an occasional - and brief- hand on the back.
Instead, the couple - who made a joint appearance at Wimbledon today - are famed for exchanging cheeky grins and subtle looks at public events.
