Meghan and Harry are due to Wednesday on May 18 at Windsor Castle in St George's Chapel.
The loved-up duo drew hundreds of people lining the streets of Brixton to catch a glimpse of the couple. Station founder Shane Carey said news of their visit had caused "massive excitement" in the area.
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Meghan Markle and Prince Harry arrive for their visit to Reprezent FM, a radio station and youth training program. Markle will join the foundation after she marries Harry.
They arrived in a chauffeur-driven auto at the studios of Reprezent FM, a community radio station which trains youngsters in media and employment skills.
The prince and Ms Markle were greeted by Mr Carey and an enthusiastic Harry told him in an apparent reference to the station: "All this is fantastic".
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Markle, 36, appeared delighted to be there and by the welcome, judging from the pictures.
Crowds had gathered outside the studios of Reprezent FM and they cheered and screamed when they were acknowledge by the couple who held hands when they first arrived, and later waited in freezing conditions after the 45-minute visit overran by nearly half an hour.
She was dressed in dark slacks with a long cream-colored coat and a cream-colored scarf wrapped around her neck.
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