Queen Elizabeth's husband, Prince Philip, was hospitalized Friday evening after experiencing chest pains, a Palace spokesman told the BBC.
The Duke of Edinburgh, 90, was taken from the queen's Sandringham estate to a cardiothoracic united at Papworth Hospital for "precautionary tests."
According to the BBC, it remained unclear whether Philip will stay overnight.
He was last hospitalized in April 2008, when he spent three days being treated for a chest infection.
Former press secretary to the Queen, Dickie Aribiter, told the BBC: "He has had these chest pains before and I don't think it's anything untoward, but given his age they are being safe rather than sorry.
The royal family, including Prince William and Duchess Kate, are planning to spend Christmas at the 85-year-old Queen's Sandringham estate.
Pippa, 28, is expected to join them on Boxing Day (Dec. 26), before the trio travels to the Middleton family's home in Bucklebury.