The late Princess Diana's old Audi convertible has been sold at auction for £58,000.

Princess Diana

Princess Diana

The plush dark green vehicle, which was used by the royal and her sons Prince William and Prince Harry during the 90s, was snapped up by an anonymous buyer for the hefty sum on Thursday (06.07.17) at an auction house in Cambridge, England.

A spokesperson for the auction house Cheffins told ABCNews: "The car was brought into Cheffins by a private buyer and had 21,856 miles on it."

Although £58,000 is an impressive sum, the auction house were expecting it to fetch at least £80,000 when it went under the hammer as it was in "immaculate condition" and "one of the most photographed cars of its generation."

Last weekend, Diana's sons took part in the ceremony at their mother's family home Althorp House in Northamptonshire on what would have been her 56th birthday.

The private service, which their father Prince Charles did not attend as he was in Canada with his wife Duchess Camilla, was conducted by the Archbishop of Canterbury, Justin Welby.

A statement, previously released by Kensington Palace, stated: "The Duke and Duchess of Cambridge and Prince Harry will attend a private service to re-dedicate the grave of Diana, Princess of Wales at Althorp House on Saturday 1 July.

"The service, which will fall on what would have been The Princess's birthday, will be conducted by The Archbishop of Canterbury and attended by her family."

Diana died on 31 August, 1997 in a car crash in Paris at the age of 36 and there is a black silhouette of the late royal at the Temple near the lake in Althorp.

Earlier this year, it was revealed that William and Harry had commissioned a statue of Diana to be erected in the grounds of Kensington Palace, where she lived.