Prince William and Prince Harry's aunt 'seriously injured' after horse accident.

Prince William and Prince Harry's aunt has been to hospital (Image: AP)

Prince William and Prince Harry's aunt, Lady Sarah McCorquodale, has been "seriously injured" following a fall during horse-riding, it has been claimed.

One of the late Princess Diana's older sisters, 70, had to go to hospital after a "bad fall," according to her brother, Earl Spencer.

The Earl, 61, said that his sister has not been enjoying her time confined to a bed and has been "quite a handful" as a patient.

Lady Sarah went out with King Charles before introducing him to the late Princess of Wales.

According to the Mail, Lord Spencer did not give any further details about hi sister's injuries.

He told the Rosebud podcast: "The lead doctor said to my brother-in-law [the land-owner Neil McCorquodale], 'She’s quite a character, isn’t she?”, which I think is code for, “Could you take her home?'"