Coleen Rooney, Soccer Star’s Wife, Says Rebekah Vardy Leaked Details to Tabloid

LONDON — Coleen Rooney has largely lived in the shadow of her far more famous husband, Wayne, a soccer star who played for one of the world’s biggest clubs, Manchester United, and anchored England’s national team for a decade.

Though Ms. Rooney is not an infrequent presence in the British tabloids, she revealed a different side of herself on Wednesday: a detective who ran her own sting operation to expose the person who had betrayed details about her family life to one of those tabloids.

Her investigation, as detailed in a post on her Instagram account, came with another twist: Her betrayer appeared to be Rebekah Vardy, the wife of Jamie Vardy, a Premier League star and former forward for the English national team.

“For a few years now someone who I trusted to follow me on my personal Instagram account has constantly been informing The SUN newspaper of my private posts and stories,” wrote Ms. Rooney, who recently moved back to Britain from the United States with her husband after he left an American club, D.C. United, to join Derby County in the second tier of English soccer.

Ms. Vardy responded in kind, with a post on Twitter. She denied speaking to journalists about Ms. Rooney, hinted that she had been hacked, and, finally, expressed regret that this had happened “especially when I’m heavily pregnant.”

Ms. Rooney, having realized that something was amiss as details about her private life that could only have come from someone close to her were being splashed in the tabloids, came up with a plan to unmask the spy.

She would restrict access to the Instagram Stories section of her private account — separate from her public Instagram account — for every account but that of Ms. Vardy, her prime suspect in the case, and then post several false stories to see what happened.

Among the stories that appeared over the past few months that Ms. Rooney now says were inventions:

On Wednesday, The Sun added a note to each of those articles online saying that Ms. Rooney “said that she made this story up in an effort to find out who was leaking to the press.”

The disclaimers link to The Sun’s own coverage of the dispute, which asserts that Ms. Rooney had been offered an opportunity to comment on each story before publication, and had declined. “Like all reputable media organizations, we don’t comment on sources,” an anonymous representative of the paper is quoted as saying.

The Sun did not respond to a request for further comment.

“It’s been tough keeping it to myself and not making any comment at all,” Ms. Rooney wrote on Instagram, “especially when the stories have been leaked, however, I had to. Now I know for certain which account / individual it’s come from.”

She acknowledged that followers of her stories may have been slightly mystified by the absence of new posts, but she was quickly praised for her detective work, with several expressing admiration for her approach.

Another poster on Twitter, mindful of the cloak-and-dagger nature of the drama, imagined Ms. Rooney as the central player in a John le Carré novel.

“Oh, and soccer.”

On Wednesday, Ms. Vardy insisted that she would never tattle. “I’m not being funny but I don’t need the money, what would I gain from selling stories on you,” she wrote. “I’m disgusted that I’m even having to deny this.”

Her letter closed with a broken-heart emoji.