Despite the buildup, the couple appeared confused when the contents of the sponge cake was revealed, as they discovered there was no pink or blue colour inside - and so still had no idea what gender their baby is.
Though the two saw the funny side to the mistake as they couldn't help but laugh at the bakery's mishap.
"I think they gave us the wrong cake! It's yellow," they joked.
For the post caption, Quintos wrote: "When the bakery has one job."