DARYN KAGAN, CNN ANCHOR: From British Prime Minister Tony Blair to Texas model Jerry Hall, they're honoring England's Queen Mum today. "Happy birthday, Ma'am" will resonate from the regal Horse Guards Parade through London in advance of the Queen Mother's 100th birthday, which is August 4 of next month. CNN's Fionnula Sweeney is live in London on this festival, wonderful day. Fionnula, hello.</s>FIONNULA SWEENEY, CNN CORRESPONDENT: Hello, Daryn, how are you? Indeed, a glorious day here in central London and welcome to Horse Guards Parade. Behind me you can probably see the end of rehearsal for this birthday tribute to the Queen Mother, which will get under way in about two hours from now. She will leave Clarence House shortly after 5:00 local time and make her way up here to Horse Guards Parade, not very far away at all. And she will then witness a tribute of about an hour and a half in length from the various military regimentary bands, also some 1,000 children, 7,000 participants in all, from the 320 charities of which she's either patron or president. She'll also hear a tribute from the British actor Sir John Mills, himself at 92. She'll also receive a huge birthday card and also, we're told, the largest birthday cake in the world, some 25 feet high. A million rose petals will be released and then shortly, about an hour and a half later, she will make her way home after herself making a very rare one-minute address to the some 12,500 people gathered here to witness this birthday tribute -- Daryn.</s>KAGAN: Fionnula Sweeney, in London, thank you very much.
England Prepares for Queen Mother's 100th Birthday