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Royal rules Meghan Markle is expected to follow

Photos Logo Photos | Slide 2 of 18: CAPTION: Britain's Prince Harry stands with his fiancée US actress Meghan Markle as she shows off her engagement ring whilst they pose for a photograph in the Sunken Garden at Kensington Palace in west London on November 27, 2017, following the announcement of their engagement. Britain's Prince Harry will marry his US actress girlfriend Meghan Markle early next year after the couple became engaged earlier this month, Clarence House announced on Monday. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)

Minimal PDA

The royals are supposed to be discreet when showing affection in public while engaging in royal duties. They are even refrained from holding hands.

© Ben Birchall - WPA Pool / Getty Images
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