The royal donned a chic lilac Emilia Wickstead dress, which she teamed with a pair of pointed nude stilettos and a matching handbag.
Kate stepped out at the first Global Ministerial Mental Health Summit - which is an initiative to help improve mental health around the world. Countries are hoping to come together to fight the stigma associated with mental health.
eBay revealed that searches for tailored maternity coats more than tripled in November 2017, after Kate and Prince William announced they were expecting their third child, while searches for British designer Jenny Packham increased two-fold following Kate's appearance with newborn baby Louis outside of the Lindo Wing, wearing a red smock dress by Packham.
Tuesday's summit focused on political figures, leading academics and policy-makers from around the world coming together with the common goal of better mental health for all. The evening is a poignant one for Prince William's wife, as it's her first visit since becoming the museum's patron in March. "This is a great, great compliment", Kate told Vargas of his painting.
Google Pixel Slate leaks in great detail before October 9 event
The Google Home Hub , left, Pixel Slate , center, and two new smartphones are displayed in New York , Tuesday, Oct. 9, 2018. On the front, it has dual 8-megapixel cameras (wide-angle and normal sensor).
The couple also learned about Friendship Bench, part of an innovative programme from Zimbabwe, which has taught elderly women the skills to become trained 'community grandmothers'.
In the lead-up to hosting a Marathon for Mental Health in the United Kingdom in 2017, Prince Harry revealed he'd sought counselling in his early 20's after two years of what he labelled "total chaos" following the death of his mother, Princess Diana.
The couple is also preparing for another big event on Friday when William's cousin, Princess Eugenie, celebrates her Royal Wedding to fiance, Jack Brooksbank, at Windsor Castle.