Duchess Kate is wearing an Erdem dress with Jimmy Choo heels and clutch. The neckline on her recent outfit is very similar to Meghan's style.
"Where can you hide it", Kate joked as she painted a white stroke, and which point Prince William said, "It's nearly ruined the picture", before adding, "No, this is probably how you ruin a picture" as he took his turn.
The Mental Health Summit will see political figures, leading academics and policy-makers from around the world come together with one common goal: better mental health for all.
Today's inaugural summit aligns with the couple's Heads Together charity and their targeted focus on mental health awareness, and is being co-hosted by the British government and the Organization for Economic Cooperation and Development (OECD), and they watched two presentations on successful mental health programmes in the United States and Slovenia.
The Duchess, who recently returned from maternity leave after giving birth to Prince Louis in Apil, became a royal patron of the museum back in March and this marks her first official visit in the role. Kate will meet with several curators who worked on the exhibit before unveiling a plaque to commemorate the opening.
The project's founder Dixon Chibanda said: "Bringing our Friendship Bench to London helps show leaders and campaigners how we can all empower communities to tackle the global gap between mental health problems and the treatments available".
For her appearance, Middleton wore a lavender Emilia Wickstead dress and carried a crocodile Aspinal of London handbag, accessorizing her ensemble with nude pumps, silver earrings and a matching necklace.
The Cambridges have two older children - Prince George, five, and Princess Charlotte, three. He has since been joined by wife Meghan Markle at mental health charity events.