Kate Middleton just wore another stunning dress by one of her favourite designers

Beautiful.

Kate Middleton appeared on The One Show this week to talk to young people about staying safe online.

The Duchess of Cambridge made an appearance alongside her husband, Prince William, to talk about their cyber bullying campaign as part of Anti-Bullying week. They hope to encourage children to spot signs of online bullying with the help of the Kids Online Wellbeing app, which aims to educate young people about how to stay safe on social media.

The couple spoke to hosts Matt Baker and Alex Jones about the work they are doing.

Prince William said: 'You are creating a practical, powerful tool to help children use their smartphones and social media with confidence and with safety. I am so proud that this has sprung out of the Cyberbullying Taskforce work.

'It’s now important that our technology partners get right behind the app to make sure all children can benefit. We’re counting on all of you.'

The Duchess of Cambridge wore a stunning turquoise dress by one of her favourite designers - Emilia Wickstead - and teamed it with a pair of black heels.

Eagle-eyed fans noticed that it isn't the first time that we've seen Kate in the dress. She is known for recycling her outfits, and she first wore it back in 2014 when she touched down in New Zealand as part of a royal tour.

The couple opened up about why they decided to get involved with the anti-cyber bullying initiative, with William revealing: 'I saw that my friends and peers were seriously worried about the risks of the very powerful tools we were putting in our children’s hands.

'For too many families, phones and social media shattered the sanctity and protection of the home.

Talking about his work with mental health charities, he added: 'I met families who had suffered the ultimate loss.

'For too many, social media and messaging was supercharging the age-old problem of bullying, leaving some children to take their own lives when they felt it was unescapable.'