‘Resourceful’ Princess Margaret saved friend from public poop mishap — twice

Princess Margaret was once No. 2 in the line of succession — and took that job quite seriously, according to a newly surfaced tale from friend Susannah Constantine.

The 60-year-old British fashion maven made some stomach-turning revelations in a recent interview about how the late royal twice saved her from bathroom-related incidents.

Constantine revealed how one time the princess turned into a posh plumber by using an ivory-handled cake knife to unclog a toilet. And another time the Countess of Snowdon stooped to “mop” up her friend, after she “pooed” herself at a celeb-filled gala.

“This is gross, but it’s an indication of her resourcefulness,” said Constantine as she recalled the fecal fracas during an appearance on “How To Be 60 With Kaye Adams.”

According to Constantine, the incident occurred at a birthday party where she was rescued by the princess and another guest.

“I fainted and shat and pooed myself,” the TV host said, without detailing exactly what led to her loss of consciousness and bowel control.

“Princess Margaret came and the two of them mopped me up, kind of bathed me down,” recalled Constantine. “I was then kind of pushed back out.”

Constantine also said that the royal helped a second time when she “went to the loo to do a number two at the Greenwich Naval College.”

According to the TV personality, Margaret, who passed away in 2002, thought her friend was “taking too long” so she decided to enter the bathroom herself.

“I was gone too long for her liking,” said Constantine.

“She thought I was being incredibly rude. And she came to find me and I heard this voice, [saying] ‘Susannah!’ And I was like, ‘Yes ma’am.’ And she kind of kicked the door open and I was sitting on the loo and my pants down round my ankle.”

“I wasn’t embarrassed at all. And I just said to her, ‘Ma’am, it won’t go down,’” continued Constantine.

Margaret allegedly told the book author to “get a knife.” Constantine returned with “a really gorgeous, ivory handled, cake slicer,” which she handed over to the princess.

Constantine says that Margaret then used the slicer to cut up the waste.

“She turned around and there was this chop, chop, chop, chop, chop, flushed the loo, handed me back the knife, which I then went to go and wash,” laughs Constantine.

Constantine says she still has the memento “to this very day.”

The Post has reached out to Constantine and Buckingham Palace for comment.