Britain's royal family announced earlier on Monday that the one-time playboy royal would marry his American actress girlfriend early next year, confirming months of speculation.
"Michelle and I are delighted to congratulate Prince Harry and Meghan Markle on their engagement. We wish you a lifetime of joy and happiness together," Obama tweeted -- stealing a march on Donald Trump's White House which had yet to officially react to the engagement.
By contrast, Harry's bride-to-be Markle has been an outspoken critic of Obama's successor Trump, and at one point vowed to leave the United States for Canada if he won election.
The British royal wedding is to take place in the spring, after which the newlyweds will live at Nottingham Cottage in London's Kensington Palace, where William and Kate -- the Duke and Duchess of Cambridge -- also live with their children.
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