Prince William and Kate get the giggles on their first joint appearance since Prince Louis: All the photos

On Tuesday (Oct. 9), <a href="/tags/0/prince-william/">Prince William</a> and <a href="/tags/0/kate-middleton/">Kate</a> made their first joint appearance since the duchess went on maternity leave in March - and they were more in sync than ever! Not only did the duo make a fashionable pair, they also showed their passion for a cause close to both of their hearts: mental health awareness. The Cambridges attended the Global Ministerial Mental Health Summit at London County Hall, where they were among political leaders, artists, researchers and policy makers all working to break the stigma associated with mental health issues and work to better the health of people around the world. While there, they also shared a few sweet laughs along the way. <p><strong>Click through to see all the photos from their engagement...</strong> <p>Photo: &copy; Karwai Tang/WireImage
After her casual royal engagement at the Sayers Croft Forest School last week, Kate traded in her Zara moto pants for a recycled look by one of her favourite designers, Emilia Wickstead. The duchess looked radiant in the pastel purple dress (aptly named the 'Kate'), which showed off her figure with its fit-and-flare design. <p>Photo: &copy; Karwai Tang/WireImage
She carried a sweet little croc 'Mayfair' bag by Aspinal of London, which boasts a $1300 price tag and perfectly matched her look on the warm autumn day. The mother of three anchored her outfit with a trusty pair of beige 'Gianvito 105' pumps by Gianvito Rossi - the same shoes she wore with the dress while on tour in Poland and Germany in 2017. <p>Photo: &copy; Eddie Mulholland - WPA Pool/Getty Images
Kate and William graciously met with officials at the event. <p>Photo: &copy; Eddie Mulholland - WPA Pool/Getty Images
The Duchess of Cambridge had a big laugh alongside her husband while helping to paint a mural at the event with artist Dairo Vargas. Art history grad Kate joked, "where can I hide it" about her contribution to the live art piece before William teased, "It's almost ruined the picture." He then said, "No, this is probably how you ruin a picture" and added his own mark. <p>Photo: &copy; Eddie Mulholland - WPA Pool/Getty Images
The couple appeared to be in very high spirits, well rested from their summer of holidaying with their children. <p>Photo: &copy; Karwai Tang/WireImage
Kate listened intently as her husband spoke to officials at the event. The aim of the initiative is to help improve mental health around the world, a cause that the royal parents work on through their various patronages and their Heads Together initiative, which they launched with Prince Harry in 2016. <p>Photo: &copy; Eddie Mulholland - WPA Pool/Getty Images
The beautiful couple greeted fans waiting outside with big smiles. <p>Photo: &copy; Eddie Mulholland - WPA Pool/Getty Images
The Duchess of Cambridge looked beautifully sun kissed and showed off her new copper lowlights during her second engagement since returning from maternity leave. The royal couple welcomed their third child, Prince Louis, in April. <p>Photo: &copy; Samir Hussein/WireImage
The couple took a seat on a Zimbabwean Friendship Bench while at the event, an innovative creation that has helped elderly people become lay health workers. The couple shared a sweet laugh and a rare display of affection as Prince William sweetly rested a hand on Kate's leg. <p>Photo: &copy; Eddie Mulholland - WPA Pool/Getty Images
The duke and duchess appeared more in love than ever while being asked to pose together. <p>Photo: &copy; Eddie Mulholland - WPA Pool/Getty Images
It looks like William the jokester might've said something funny! <p>Photo: &copy; Eddie Mulholland - WPA Pool/Getty Images
They looked so happy to be joining forces again for a good cause! <p>Photo: &copy; Eddie Mulholland - WPA Pool/Getty Images
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