Mr Obama, who was then in office, was not invited to that wedding but the United States was represented by its ambassador to the United Kingdom.
The Government source noted that the wedding venue, St George's Chapel in Windsor Castle, was significantly smaller than Westminster Abbey, where Prince Harry's older brother William Wednesday Kate Middleton in 2011.
It is so obvious that Royal wedding will be dotted with the presence of world leaders.
Kensington Palace revealed Tuesday the soon-to-be newlyweds chose not to have an "official list" of political leaders join in their marriage celebrations, instead opting for some 2,640 family members, friends and public citizens to attend what's sure to be the wedding of the year. After all, Prince William is in direct succession to the throne, and Prince Harry isn't.
There has been plenty of speculation on who will make it to the guest list of #Prince Harry and #Meghan Markle. It's been speculated the decision not to invite that fam was made in order not to diplomatically shade Trump: just imagine that goddamn tantrum.
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The list includes Phillip Gillespie, a soldier from Northern Ireland who lost his right leg in a combat incident in Afghanistan, where Harry also served, and a number of people who have founded charities.
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The Royal Palace clarified that since the royal wedding is a private event and not an official function so it would not invite world leaders.
That will give them an excellent vantage point to see the royals arrive at the chapel and to see Harry and Markle's carriage procession after the wedding ceremony.
The BBC reported 12-year-old Amelia Thompson, who was injured during an attack at the Ariana Grande concert in Manchester, was among those who received an invitation.
Of those, 1,200 have been picked out by royal officials from around the country and the remainder will be members of the public, guests from charities associated with the couple.