It was a crappy Sweet 16!

A Pennsylvania girl was showered with more than just presents and affection – as poop fell out of the sky and marred her special day.

“Out of nowhere, from the sky, comes a bunch of feces, lands on her,” Jacinda Cambray’s stepfather, Joe, told FOX 29.

Most of the foul matter – which may have come from a plane – landed on a canopy as the 40 guests were swimming and playing horseshoes in the Levittown back yard on Sunday.

“We just got done with cake. Thank God,” said Kristie Rogy, Joe’s sister. “We took the cake back in, because within two minutes, something fell from the sky. It was brown, it was everywhere, it got on everything.”

Joe said he used a hose to spray the malodorous mess off everything.

Rogy used a smartphone app to find out that five potentially party-pooping planes were flying overhead at the moment of impact.

The mortified family lodged a complaint with the FAA, which said it will investigate.

Toilet waste must be disposed of only at airports, the agency said.