Prince William’s lawyers are hitting back hard after U.K. media outlets continue to report that he cheated on his wife Kate Middleton while she was pregnant with their third child. Attorneys for London law firm Harbottle and Lewis have fired off letters threatening legal action, according to reports. 

“In addition to being false and highly damaging, the publication of false speculation in respect of our clients’ private life also constitutes a breach of his privacy pursuant to Article 8 of the European Convention to Human Rights,” the letter reads.

The rumor is, William stepped out with their neighbor, the Marchioness of Cholmondeley, Rose Hanbury, while Kate was expecting Louis

The Palace has reportedly also pressured reporters; when Giles Coren, a writer for the Times of London sent a tweet out about it, it was almost immediately deleted, reportedly due to the Palace’s demands.

Unlike the U.S., libel law in the U.K. puts the burden of proof on truth; in other words, a defendant has to prove that what they said was true, unlike in the U.S., where they just have to prove that it could be true. 

Many on social media, meanwhile, speculate that William is following in his father Prince Charles’ footsteps, who stepped out on William’s mother Princess Diana with his current wife, Camilla, the Duchess of Cornwall.