Their puzzling prank left the bride in pieces.

Unbridled, unsupervised children are a plague on weddings that most just-married couples hope to avoid.

But one unlucky newlywed’s “kid-friendly” fête was all fun and games until she discovered that the naughty tots had ruined the look of her picture-perfect guest book.

“Instead of doing a traditional guest book, we opted for a puzzle, where each guest was asked to sign a piece,” an anonymous bride, who tied the knot “a few days ago,” explained to Reddit readers.

“Afterwards we would construct the puzzle and mount it on the wall so that we could see all the people that were there to celebrate with us,” she added.

However, instead of a heartwarming work of art, the freshly-hitched sweethearts ended up with a hot mess — courtesy of the roguish rugrats.

“Unfortunately, a couple of guests were live streaming the entire night instead of watching their children,” lamented the livid bride.

“When I got home and put the puzzle together, I saw that not only did the kids sign about 20 pieces with their own names,” she ranted, “but they also wrote on pieces that were already signed by other guests as well as the big piece for the middle that has our name and the event date.”

It’s a nightmarish end to any bride’s dreams — no kidding.

To dodge the childish drama, gals gearing up to walk down the aisle have established strict “no kids allowed” rules ahead of their big days, hoping invitees will take heed.

But rebellious moms and dads, much like their mischievous children, don’t always do as they’re told.

Claire Kendall Taetz, 25, a Texas bide who said “I Do” last month, struggled to recite her vows thanks to parents who brought their wailing infant to her “adults-only” nuptials.

“The crying baby definitely distracted me and left me feeling disrespected,” said an agitated Taetz in a trending TikTok post. “I was just on edge the whole time.”