The Royal Family Account also released three previously unseen photos of the Princess Royal. The photos were taken by photographer John Swannell in February and show Princess Anne at her home in Gloucestershire.
One called her a “hard working family member who loves the simple approach to life.”
Another called Princess Anne a “beacon of service,” adding: “May her day be filled with joy, happiness and love.”
One Instagram user, who also sent birthday wishes, even claimed to have met the Princess Royal.
They said, “I met her earlier this year at a professional event. Such a lovely lady.
Other users responded simply with emojis and birthday wishes. One of them said on Friday evening: “Beautiful photos. I look great for 70 years. Happy birthday for tomorrow. ”
Another commented on the Princess Royal’s dress in one of the photos: “Green looks good on her.”
READ: Royal Snap: The surprising similarity these royals share and what it means
He also took the official photos of his 40th, 50th and 60th birthdays.
The photographer is also known to have photographed other members of the Royal Family, including the Queen.
In addition to the photographs, Princess Anne’s birthday was also celebrated by the arms of the British Armed Forces.
She was appointed to the rank of general by the army and to the rank of air chief by the Royal Navy.
Members of the royal family are often promoted through the military ranks as they age.
The Royal Navy also took to Twitter to send Princess Anne a birthday message.
They tweeted: “Happy Birthday to HRH the Princess Royal, who is celebrating her 70th birthday tomorrow. “
The Defense Ministry said of the Princess Royal’s military promotions: “This promotion on her 70th birthday recognizes her invaluable contribution and commitment to the military.”
Speaking to ITV in a documentary released ahead of her birthday last month, Princess Anne spoke about home schooling during the lockdown, calling it a “challenge”.
She also said the lockdown was “the longest time I have ever spent” at her Gatcombe Park residence.