Britain's Prince Harry and his fiancée Meghan Markle performed their first official engagements together on Friday.

The visit to a charity fair to mark World Aids Day is particularly symbolic for Harry whose late mother Princess Diana is credited with playing a leading role in breaking down the stigma that was attached to the disease.

Queen Elizabeth's grandson Harry, currently fifth-in-line to the throne, and U.S. actor Markle, best known for her leading role in US.= legal drama "Suits", announced their engagement on Monday, igniting a transatlantic media frenzy.

They are to be married next May in St George's Chapel at Windsor Castle, a family residence of British kings and queens for almost 1,000 years.

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