The 62-year-old had last posted on September 8, when she shared a loving tribute to her late mother-in-law.
But on Tuesday, Sarah got back on social media, unveiling a bold look in the process.
Sarah shared a striking portrait photo showing her dressed in equestrian-style clothing, staring straight down the camera and holding a top hat.
Sarah looks striking in her latest photograph
She wrote in the caption: “I hope to see you at Henley Literary Festival Wednesday, Oct 5, 2PM where I’ll be chatting with @marguerite_kaye about Her Heart for a Compass. Click the link in my bio to claim your tickets now my lovely readers! Xx.”
Fabs went wild for her appearance, with one remarking: “What a beautiful photograph of you!” A second agreed, writing: “Amazing photo!!” A third added: “Simply beautiful.”
She paid a loving tribute to the late mother-in-law
Sarah had previously received an outpouring of love when she shared her poignant tribute to the Queen last month.
She touched on their special bond, writing: “I am heartbroken by the passing of Her Majesty the Queen. She leaves an extraordinary legacy: the most fantastic example of duty, service, steadfastness, and a constant steadying presence as our head of state for more than 70 years. She has given her whole life selflessly to the people of the UK and the Commonwealth.
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“To me, she was the most incredible mother-in-law and friend. I will always be grateful to her for the generosity she showed me in remaining close to me even after my divorce. I will miss her more than words can express.”