The duchess stepped out in a blue Jason Wu dress with figure-flattering ruffles at the front, trading her recent black ensembles for a pop of colour. The gala concert marked the centenary of the end of World War I and raised funds for veterans groups.
Harry and Meghan were greeted by former Army chief Lord Dannatt at Central Hall in Westminster, London, on Thursday night for the concert titled 100 Days To Peace.
The gala was in aid of three charities: Help for Heroes, Combat Stress and Heads Together-the latter of which Harry is closely involved with, along with the Duke and Duchess of Cambridge.More news: LeBron on Kaepernick ad: I stand with anyone who believes in change
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Harry and actress Meghan married in a star-studded ceremony at Windsor Castle in May. "Harry is tactile and protective of his new wife".
In the intermission, they were to meet with performers and charity leaders.
He said: 'One of the tremendous spin-offs from the two tours that Prince Harry did in Afghanistan, both on the ground and as an Apache pilot, was that he really got to experience and share the same circumstances that everybody else did.