Royal family member Peter Phillips chose a "timeless" engagement ring to propose to his now fiancée, Harriet Sperling, that is worth upwards of $20,000 AUD.

Princess Anne's son releases a photo to announce his engagement to Harriet Sperling.

Peter Phillips was the first of Queen Elizabeth III and Prince Philip’s grandchildren to have kids of his own. Peter, the son of Princess Anne and ex-husband Captain Mark Phillips, married Autumn Kelly in 2008.

"Mr. Peter Phillips, the son of HRH The Princess Royal and Captain Mark Phillips, and Ms. Harriet Sperling, daughter of the late Mr. Rupert Sanders and Mrs. Mary Sanders of Gloucestershire, have today confirmed their official engagement," spokesperson Gerard Franklin told Hello! in a statement.

The King’s nephew, Peter Phillips, has announced his engagement to his girlfriend, Harriet Sperling. The couple released new photographs to mark the occasion, with Ms Sperling showing off her engagement ring. The King, Queen and senior royals have been told the news, but a date has yet to be officially set for the wedding.

The son of Princess Anne has been dating the NHS nurse and freelance writer for more than a year, and they have appeared together at Royal Ascot and Wimbledon.

There's a royal wedding ahead! Peter Phillips announced his engagement to Harriet Sperling. This will be the second marriage for Princess Anne's son.