Queen Elizabeth II and Prince Philip, Duke of Edinburgh
06/04/2012 AT 02:00 PM EDT
Sadly, the Queen's "emotional rock"
– as grandson Prince Harry
described his paternal grandfather – will not be with her for her Diamond Jubilee pop concert.
Prince Philip, the Duke of Edinburgh, who will turn 91 next Sunday, was rushed from Windsor Castle on Monday to London's King Edward VII Hospital, according to a statement from Buckingham Palace.
The hospitalization was described "as a precautionary measure after developing a bladder infection, which is being accessed and treated," and according to the statement, "Prince Philip will remain ... under observation for a few days."
On Sunday, Philip stood with his family in the freezing rain for four hours during the Queen's Diamond Jubilee river pageant
"He is, understandably, disappointed about missing [Monday's] Diamond Jubilee Concert and [Tuesday's] engagements," the statement continues.
Late last year, he was hospitalized with chest pains
and had an emergency coronary angioplasty
. The prince, who had already lightened his work schedule because of his advancing age, made a full recovery and emerged in good spirits.