The Duke of Cambridge will celebrate his 30th birthday tomorrow in a "low-key" and "private" fashion, St James's Palace has said.
William has been busy this week on a course connected with his work as an RAF Search and Rescue Force pilot.
But he will take time out to mark the milestone, although it appears he is not planning a big event.
Low key: Duke of Cambridge William with Duchess Kate
A St James's Palace spokesman would not give any details about how the Duke will celebrate his birthday only saying "He'll be spending it in a low-key, private fashion."
His wife Kate, who turned 30 in January, is almost certainly to be behind any events that are planned, and also has the tricky job of finding a present for her husband.
It is likely that a few close friends will be invited to the occasion which could be a quiet meal at their home in North Wales.
William's 30th birthday is an important milestone for the royal who could one day be King.
The Duke is a happily married man who wed Kate, his university sweetheart, during a glittering ceremony last year watched by an estimated television audience of billions.
He is also forging ahead with his RAF career, and earlier this month it was announced the royal had qualified as an operational Captain and can now command RAF Sea King helicopters during rescue missions.
The birthday also comes during the Queen's Diamond Jubilee year which has seen her receive the adulation of the country during national celebrations held over the extended Bank Holiday weekend at the start of June.
William and Kate joined the Queen in Nottingham last week for a tour marking her 60-year reign, a visit which saw thousands of well-wishers flood into the city to see the royals.