The source said: 'The possibility of a reunion has been discussed and Meghan looks set to incorporate it into her trip.
The clip is accented with a "Happy Birthday" sticker and sees Markle hold up her hands, each finger of which is adorned with a raspberry.
Harry (33) meanwhile looked dapper in a morning suit in his reported role as best man for Charlie, a childhood friend, who was among his ushers at his wedding to Meghan in May.
It has been claimed that the two have only communicated via text since her 19 May wedding to Prince Harry.
Prince Harry and van Straubenzee went to prep school together, and have been friends ever since.
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Another added, "Meghan stole the show with her deliberate wardrobe malfunction".
Princess Eugenie, the daughter of Prince Andrew and Sarah Ferguson, and her finance Jack Brooksbank, who are also due to marry at Windsor Castle this October, also attended the wedding festivities.
In the same interview, Harry said: "I tried to warn [Meghan] as much as possible, but I think both of us were totally surprised by the reaction after the first five, six months that we had to ourselves, of what actually happened from then".
It's no secret being a part of the British royal family comes with a whole host of benefits, but as we've seen time and time again there are plenty of drawbacks too.
Prince William and Kate had been expected to attend but did not make it to the wedding. Markle was known for her humanitarian work prior to meeting Harry, serving as the global ambassador for World Vision and working with the United Nations on women's issues.