Unfortunately for the royal family, both Buckingham Palace and Clarence House named the sisters the wrong way round in the photo captions.
Royal commentator Victoria Arbiter was quick to jump on Twitter to note the error.
"Eek both Clarence House and Buckingham Palace named Diana’s sisters the wrong way round!"
Lady Jane is standing next to Doria and Lady Sarah is next to William," she tweeted, after the images were released.
Thankfully, the mistake was rectified a few hours later.
The sisters' inclusion in the portrait is thought to have been a sweet nod to Harry's late mother, Diana.
While the couple were surrounded by family for the occasion, Meghan's own father, Thomas Markle, was not invited to the ceremony, and he has spoken out after being snubbed by his daughter.
"Of course I would have enjoyed being there for the blessing, wishing Archie and his parents’ health and happiness,” he told the Mail on Sunday.
The Archbishop of Canterbury, Justin Welby conducted the private ceremony while some members of the St George’s Chapel Choir, a choral group who performed at Harry and Meghan’s wedding, sung during the christening.
Keeping with royal family tradition, baby Archie wore the handmade replica of the royal christening robe, made by Angela Kelly, dressmaker to the Queen.