This bride got a wedding crasher — courtesy of one of her own guests.

A woman on Reddit’s r/weddingshaming forum says she was stunned when her long-awaited wedding photos finally arrived — and she spotted a complete stranger mingling with her friends and family.

“I saw a woman I didn’t know in our wedding photos months after the wedding,” the baffled bride wrote, explaining that she and her husband had painfully pared their guest list down to 100 people.

“Everyone invited were people dear to us and we really had to think of the guest list to be able to stick to the 100 headcount.”

Invitations, she noted, made the seating numbers crystal clear.

But when the photos hit her inbox two months later, one unfamiliar face stood out like an uninvited sore thumb.

She initially assumed a rogue relative had pulled their classic stunt of dragging along an unapproved guest.

“Turns out one of our high school friends brought her mom!” the bride wrote, still in disbelief.

She didn’t mince words about the outrageous RSVP overreach.

“I truly don’t understand what goes on in people’s heads when they decide things like this,” she fumed.

“Our catering and the seats were only for 100 people. Do they not realize food won’t just magically appear to feed the extra person? That an extra chair won’t just turn up out of nowhere?”

The only reason the gatecrashing mama even had a place to sit? Pure luck — a guest came down with a fever the night before and bailed.

“Someone wasn’t able to go at the last minute… so there was thankfully one extra seat,” she wrote. “Imagine if he was able to. Where would the mom go?”

Commenters piled into the thread with all the subtlety of a bouquet toss gone wrong.

“Incredibly rude to bring someone uninvited,” one user fumed, while another doubled down: “It’s still rude and ignorant. I don’t care if food and chairs suddenly appear. That’s not the point.”

Plenty of brides-to-be chimed in with their own wedding nightmares.

One confessed she’s already stressed about potential crashers, admitting she’s terrified her hotel venue will let random guests “just pop in” to her courtyard ceremony.

Others said they weren’t shocked by the audacity, with one saying even the best-planned weddings survive rogue guests.

Life “never actually goes perfectly to plan,” they wrote, adding that you can’t control “the implications of poor/inconsiderate decisions of other people.”

Still, the consensus was clear. The extra attendee was “frustrating, selfish and inconsiderate.”