The royal, 38, looked typically stylish in a monochrome midi skirt teamed with a white top. Kate completed the stunning look with a pair of black flats.
The 38-year-old accessorised with a gold necklace, bracelet and hoop earrings, while her glittering engagement ring was on her left hand.
Kate swept her brunette hair off her face in a chic up do.
The low-key outing in the capital earlier this month comes as the Cambridges have returned to Kensington Palace.
Prince William, 38, Kate and their three children spent much of the lockdown at Anmer Hall in Norfolk.
At the height of the pandemic, William and Kate kept busy with virtual engagements.
They also had their hands full home-schooling Prince George, seven, Princess Charlotte, five, and two-year-old Prince Louis.
But as coronavirus restrictions have eased, the couple are resuming face-to-face duties.
William and Kate carried out a series of royal engagements in London on Tuesday.
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Their next stop was the East London Mosque and London Muslim Centre in Shadwell.
William and Kate chatted to volunteers who delivered meals and medication to vulnerable members of the community during the pandemic.
They also met those who benefited from the support – a project which has received financial help from the National Emergencies Trust, of which William is patron.
The couple finished their busy day at Beigel Bake in Brick Lane.
The 24-hour bakery was forced to reduce its opening hours during the pandemic and the Cambridges were told how this affected employees.
They also heard how the business helped the local community through food donations and deliveries.
And the royal pair had a go at baking bagels.
Fiona McVeagh, who has worked at the eatery for 33 years, said: “They are pretty good, especially her – she clearly knows how to bake.”