Catherine glows in recycled lilac dress during loving display with William

The event was attended by political figures, experts and policy makers who proceeded to discuss issues such as how to deal with the stigma attached to mental health - a subject very close to the royal's heart.

On Tuesday the Duchess joined husband Prince William for the Global Ministerial Mental Health Summit in London, connected to World Mental Health Day on Wednesday.

They need all the support they can get.

"In a country where only few have access to health services, the awareness level about mental health issues is rare".

During the event, William aimed a good-natured ribbing at his wife after Middleton, who studied art history at the University of St. Andrews in Scotland, added a brushstroke to artist Dairo Vargas' painting.

The royal donned a chic lilac Emilia Wickstead dress, which she teamed with a pair of pointed nude stilettos and a matching handbag.

Fans noticed the Duchess had worn the dress in Hamburg last year — Samir Hussein WireImage

"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.

Kate only returned to royal duties last week after taking maternity leave for the birth of the couple's third child Prince Louis.

They also reveal connections between mental health and a robust economy, making special mention of the sliver of global aid ― less than 1 percent ― that is directed to various services, while also noting that "domestic financing on prevention, promotion and treatment is similarly low". It should, as the royal donned the same Emilia Wickstead number back in July 2017 during a trip to Germany.

Doyle-Price will lead a taskforce of national and local government, self-harm charities, clinicians and those personally affected by suicide to drive forward a mental health strategy.

The next appearance for the Duke and Duchess of Cambridge and the Duke and Duchess of Sussex is expected to be at the wedding of William and Harry's cousin, Princess Eugenie, when she marries Jack Brooksbank on October 12. Globally, more than one billion people live with a mental illness, but provision varies radically according to where you live.