Prince William was once just a kid at school trying to deal with bullies. A new memoir claims that he had to deal with teasing after topless photos of Princess Diana were published.

According to the Daily Mail, in Conde Nast chairman Nicholas Coleridge’s upcoming memoir “The Glossy Years,” he recalls how Princess Diana reacted after topless photos of her were published.

She visited the Vogue House for lunch and revealed that William was having trouble with the boys at school. Apparently, they teased the future Duke of Cambridge about the size of his mother’s breasts. Diana allegedly asked for Coleridge’s opinion on her chest.

“‘He was so upset. He said some of the boys were teasing him saying my t--s are too small,’ before adding: ‘Are my breasts too small, do you think?’” Coleridge writes.

The author tried to be a gentleman, telling Diana that they were “perfect” and “not to worry.”

These days, Prince William is very much in support of anti-bullying campaigns. Last November, he and wife Kate Middleton supported several campaigns that were dedicated to fighting cyberbullying. In a speech at BBC Broadcasting House in London, he noted that tech companies needed to find better ways to fight bullying on their platforms.

“On every challenge they face – fake news, extremism, polarisation, hate speech, trolling, mental health, privacy and bullying – our tech leaders seem to be on the back foot,” the Duke of Cambridge said in a speech (via The Guardian). “Technology companies still have a great deal to learn about the responsibilities that come with significant power.”

Princess Diana and Princes Harry, William and Charles Princes William and Harry are pictured with Princess Diana and their father, Prince Charles, at a commemoration ceremony of VJ Day on August 19, 1995 in London. Photo: JOHNNY EGGITT/AFP/Getty Images