During a surprise visit to London school, Burlington Danes Academy, to address students at a midday assembly yesterday, the father-of-(almost)-three spoke about the mental health issues now affecting teenagers.
Chatting with Samara Hackett-Valton and Sophie Crowder, both 15, he admitted he has real concerns over body image and how women are portrayed online.
Exploring the damaging influence of the Internet further, he commiserated with the students on the pressure they feel: "That's a lot".
Speaking at a Charity Commission AGM earlier this year, William added: "I remember being taken by my mother to a homelessness shelter at a young age, her explaining to me why the people I met there matter, why no society can be healthy unless we take other people seriously".
He also sympathised with the challenges faced by young people today through the online world.
And he went even further, telling students to make sure to spend time offline: "Don't spend all day online". You must be aware of that, it's a lot of pressure. You're going to be bamboozled, ' he said. "It's important that you balance the time".
Arthur Edwards AFP Getty Images
William surprised pupils at the school by arriving during a midday assembly with rapper Professor Green, who has also spoken out passionately on the issue.
Prince William and the Duchess of Cambridgeare eagerly awaiting the arrival of their third child in April, and Thursday night at the Centrepoint Awards at Kensington Palace, the Duke joked he wouldn't be able to cope if his wife was expecting twins.
On second thought, maybe he's not as hip as we believed.
William later addressed how communication can easily be misinterpreted online. "Unless you punctuate it correctly-I'm not the best at punctuation and I'm not the grammar police, either-you can read it in 100 different ways", he said of hurt feelings over texts and social media.
The awards celebrate the achievements of young people who have turned their lives around after experiencing homelessness.
'KAA has been temporarily relocated next door and is still using BDA facilities'.
Hossler, Streelman share lead at Pebble Beach
Northern Ireland's world number eight Rory McIlroy had six birdies and two bogeys in his four-under 68 at Spyglass. But it's Streelman and Hossler who lead the way after one round following their excellent opening rounds of 65.