The Queen received the adulation of the country as the national Diamond Jubilee celebrations draw to a close.
Ecstatic crowds have greeted her on the streets of London, and at a thanksgiving service the Archbishop of Canterbury praised her dedication to service during her 60-year reign.
Only the absence of the Duke of Edinburgh, admitted to hospital with a bladder infection, added a sad note to the day.
Philip is said to be "disappointed" at missing the festivities marking the end of the extended Bank Holiday.
In his sermon at St Paul's Cathedral Dr Rowan Williams paid tribute to the Queen's selflessness and also remembered the Duke, saying "our prayers and thoughts are very much with him this morning".
Addressing the 2,000-strong congregation he said: "I don't think it's at all fanciful to say that, in all her public engagements, our Queen has shown a quality of joy in the happiness of others; she has responded with just the generosity St Paul speaks of in showing honour to countless local communities and individuals of every background and class and race.
"She has made her 'public' happy and all the signs are that she is herself happy, fulfilled and at home in these encounters.
"The same, of course, can manifestly be said of Prince Philip, and our prayers and thoughts are very much with him this morning.
"To declare a lifelong dedication is to take a huge risk, to embark on a costly venture. But it is also to respond to the promise of a vision that brings joy."
The Queen's day began with changes to her plans to accommodate her missing consort who has been by her side throughout her six decades on the throne.