The portrait was photographed by Chris Jackson — the husband of Kate Middleton’s personal assistant Natasha Archer — in June at Kensington Palace.
The trip is part of a European tour on behalf of Britain’s Foreign and Commonwealth Office.
She was there for a tour of the V&A’s new Exhibition Road Quarter, which comprises a vast new courtyard and underground gallery designed by the British architect Amanda Levete and her company AL-A.
A patron of the 1851 Trust, she took part in the charity’s Land Rover Bar Roadshow held at the Docklands Sailing and Watersports Centre.
She wore a navy tweed Rebecca Taylor skirt suit.
The duchess wore a custom made Alexander McQueen ensemble.
She wore a soft blue coat from Emilia Wickstead with Kiki McDonough earrings.
On Monday, the Duke and Duchess of Cambridge released a photo of their youngest daughter ahead of her birthday on May 2.