Not only did one other guest at the wedding also wear the same fashionable dress, but five other women showed up in the same dress.
In a follow-up post, Ms Speranza wrote: "I am laughing so hard at the moment.can not believe how many likes (over 10,000) and comments (over 600) for my photo about the dresses at the wedding forever new you owe me a gift voucher for the advertisement".
We get why the Debbie Lace Pencil Dress might appeal to a woman named Debbie Speranza, but we're amazed it was so popular with the other guests! "I think I deserve a gift voucher for all this advertisement".
But what could have been considered every woman's worst nightmare was taken in stride by the group, who laughed off the hilarious coincidence.
"Hahaha! This is priceless".
The Forever New Debbie Lace Pencil Dress is navy with a shorter nude slip IS IT ALL WHITE? "Lovely dress", wrote one Facebook contributor, as another added: "OMG worst nightmare".
"It looks good on all of them too!" posted one admirer, as another said: "Hehehe I thought oh wow I love their bridesmaid dresses!"
The dress is described on Forever New's website as "perfectly tailored to flatter and accentuate your figure" and it's clearly a popular choice.
One woman believed the best way to handle the situation was to "laugh it off".
Would YOU go home and change if someone wore the same dress as you?