Although the couple have attended a wedding before (the nuptials of Harry's friends in Jamaica), appearing together at Middleton's wedding is a big deal.
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Meghan Markle and Prince Harry have been photographed arriving at the wedding reception of Pippa Middleton and James Matthews over the weekend.
As previously reported, Harry, 32, drove 90 minutes to London after the Church ceremony to pick up Markle, 35, so they could attend the private reception as a couple, marking a major milestone for the pair.
The just released photo of the couple in the car is the first of the Suits actress taken on that day.