The Queen's presence at the opening ceremony will not be the only royal appearance at this summer's Olympics, after Zara Phillips won her battle to appear at London 2012 as part of the British equestrian team.
British Olympic Association officials have confirmed that the Queen's granddaughter would compete in Greenwich Park this summer, following in the footsteps of her mother and father.
Her hopes had hung in the balance since the retirement last year of her longstanding mount Toytown, but she is believed to have been chosen for one of five places in the British eventing team riding High Kingdom. The other members of the team are expected to be William Fox-Pitt, Mary King, Tina Cook and Piggy French, who won last year's test event in Greenwich.
Phillips' chances of making the Games had been virtually written off following the retirement of Toytown last year, but she boosted her selection chances when she came third at Bramham Horse Trials on High Kingdom.
Phillips won the 2006 world championships on Toytown, and was named BBC Sports Personality of the Year the following December. However, injuries to the horse in 2004 and 2008 meant that she never competed in an Olympic Games.
The news will doubtless please many of those with tickets to watch the eventing in Greenwich Park, as well as Olympic sponsor Samsung. Along with David Beckham, who is expected to make the Team GB football squad, she acts as an ambassador for the electronics brand.
Her new mount, which she has ridden sporadically throughout her career, is not considered to be in the same class as Toytown. But after finishing third at Bramham, she spoke of High Kingdom's rapid improvement and that, combined with her experience as a rider in major competitions, is likely to have tipped the balance in her favour.
Phillips, who is married to former England rugby captain Mike Tindall, said: "It's awesome to be given this opportunity.
"I am really excited and can't wait to kick on and get him there. Hopefully, we will make it this time."
Phillips's mother, Princess Anne, competed in the 1976 Olympic Games as a member of the British team in Montreal on the Queen's horse Goodwill. As a representative on the International Olympic Committee, she was a vocal advocate of the campaign to bring the Games to London. Her father, Captain Mark Phillips, won a gold medal in 1972 and a silver in 1988.
A BOA spokesman said: "I can't comment on who has been selected until the team has been officially announced later this week."
Phillips will take one of five slots on the eventing team in a sport expected to deliver medals for Team GB.
Part of the rationale for holding the equestrian events in central London in Greenwich Park as opposed to a venue further from the athletes' village is to appeal to spectators and TV viewers who have not considered watching it before.
The presence of the 13th in line to the throne in eventing competition is only likely to add to the interest and anticipation around an event that was among the first to sell out when tickets went on sale last year.
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