Ahead of his engagement party over the weekend, the San Francisco 49ers running back helped fiancée Olivia Culpo into “the world’s absolute tightest dress” — and even came to her rescue when the style split down the back.

In a “get ready with me” TikTok, the 27-year-old athlete zipped Culpo, 31, into her bridal white Vivienne Westwood mini.

“I need literally a professional,” the model joked in the clip, before declaring it a “Christmas miracle” when McCaffrey managed to zip it up.

But her joy was short-lived.

“The dress just broke,” Culpo revealed moments later, adding that the zipper “completely split” and showing off the evidence on camera.

“That’s never happened to me before,” she added.

Luckily, her “damage control team” — including her husband-to-be — was able to mend the frock in time for the fête.

“I don’t even know how we were able to fix that but there is a God out there,” Culpo said, adding of McCaffrey, “He fixed my dress, he’s a jack of all trades.”

In addition to repairing her outfit, the football player even helped her accessorize.

“I’m going to go with these because that’s what the fiancé likes better,” Culpo told fans of her sparkly white René Caovilla sandals for the event.

McCaffrey, for his part, wore a white knit polo with matching trousers and sneakers.