LONDON -- Queen Elizabeth II's husband is expected to spend a second night in a hospital where he is recovering from a heart procedure, palace officials said Saturday.

Prince Philip, 90, had a coronary stent put in late Friday to fix a blocked artery, though the palace has refused to say if he had a heart attack.

On Saturday, Philip was visited by the queen and his four children at Papworth Hospital, where he was admitted after chest pains at the queen's Sandringham estate in Norfolk.

The illness has cast a shadow over the royal family's traditional Christmas gathering at Sandringham, the first to include Prince William's new wife, Catherine. Buckingham Palace said Philip is not expected to attend church today with his family, but the service will go on as planned.

A helicopter brought Elizabeth to Papworth Hospital, about 70 miles from London, shortly after 11 a.m. Saturday. She was accompanied by Princess Anne, Prince Edward and Prince Andrew.

Philip is "in good spirits, but he is eager to leave," Buckingham Palace said. After spending 45 minutes with Philip, the royals traveled back to Sandringham, it added.

The palace said Prince Charles and his wife, Camilla, arrived 45 minutes after the queen for a separate visit and that no other family members were expected to visit Saturday.