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Sarah Ferguson Celebrates Princess Eugenie's 34th Birthday: 'You Continue to Amaze Me Every Day'

“You will always be my silly, sweet, smart, and thoughtful girl," Fergie wrote to her youngest daughter

<p>Dave Benett/Getty </p> Sarah Ferguson and Princess Eugenie

Dave Benett/Getty

Sarah Ferguson and Princess Eugenie

Sarah Ferguson is showering Princess Eugenie with love on her special day!

The Duchess of York, 64, celebrated Eugenie's 34th birthday with a heartfelt post shared on Instagram Sunday.

Alongside a photo of the mother-daughter duo — in which Fergie wrapped her arm around Eugenie — the Duchess penned a sweet message to her youngest daughter.

“Happy birthday to my amazing daughter @princesseugenie,” she wrote. “I am so proud of the incredible woman you have grown up to be.”

Related: Princess Eugenie Celebrates 'Incredible Women' with Candid Family Photos Featuring Princess Beatrice and Fergie

“You continue to amaze me every day in your hard work, your grace, kindness, and the care you show to others,” she continued. “You will always be my silly, sweet, smart, and thoughtful girl. I love you, Eugenie. Happy birthday.”

Recently, Eugenie and Princess Beatrice have both rallied around their mother amid her skin cancer diagnosis, which she announced in January, just months after undergoing a mastectomy to treat an early form of breast cancer.

Related: Sarah Ferguson Says She’s ‘Feeling Positive' from 'Support of My Family’ amid Skin Cancer Diagnosis

Shortly after the announcement, a friend of the Duchess told PEOPLE that her "family is rallying 'round” — especially her daughters.

"They've been terrific since the summer," the friend added.

<p>Dave Benett/Getty </p> Princess Beatrice, Sarah Ferguson and Princess Eugenie

Dave Benett/Getty

Princess Beatrice, Sarah Ferguson and Princess Eugenie

Fergie herself has also praised Eugenie and Beatrice, 35, for their support, calling them her “cheerleaders” following her breast cancer diagnosis.

“My two wonderful daughters are my wholehearted cheerleaders, my devoted champions and my soulmates,” she told PEOPLE last November, adding that the two “have been as supportive as can be, as they always are.”

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Earlier this month, the Duchess also praised her daughters for their activism while speaking with PEOPLE about her latest endeavor — helming Global Citizen NOW: Melbourne, a summit dedicated to ending extreme poverty.

"We need to leave this earth and know our grandchildren’s grandchildren will be able to live and thrive here,” she told PEOPLE, adding, "My daughters are incredible, brilliant, passionate young activists, and they inspire me constantly."

The Duchess of York shares Eugenie and Beatrice with her ex-husband, Prince Andrew. The pair are also grandparents to Beatrice and Edoardo Mapelli Mozzi’s daughter Sienna, 2, Edo’s young son Christopher Woolf, 7, from a previous relationship, and Eugenie and Jack Brooksbank’s sons August, 3, and Ernest, 9 months.

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Read the original article on People.