Sarah Ferguson, 61, joined the royal family in 1986 when she wed Prince Andrew. The couple divorced ten years later but have two children together, Princess Beatrice and Princess Eugenie.
The Duchess sat outside drinking tea with Alan and Craig.
She looked smart without being too dressy in a plain black shift dress and a cream blazer.
The blazer had buttons and an open collar featuring a navy blue border.
Subtle red spots were dotted on the blue, making the blazer a little jazzier and less plain.
Her subtle blusher defined her cheeks and her lashings of black mascara made her blue-green eyes stand out.
She wore a nude lipgloss and her eyebrows were lightly coloured in.
Her famous red hair billowed in the breeze and hung in natural waves down to her shoulders.
Earlier this year, in July, Sarah appeared in a fashion photoshoot with glossy magazine Town and Country.
The extravagant shoot revealed the Duchess of York wearing various bright, colourful outfits.
One look was particularly raunchy as Sarah sported an Alexander McQueen red and black bustier atop a white blouse.
In another photo, she wore a fuchsia-coloured bright dress from New-York based designer clothing brand Aliétte.