Princes William and Harry have been invited to the charity do – held in honour of boxing legend Muhammad Ali.
It is also set to feature David and Victoria Beckham, Sharon Stone, Michael Douglas and Catherine Zeta-Jones.
Brad and Angelina are in the UK while she films new movie ‘Maleficient’.
They will be raising funds for the Sports For Peace initiative with a black tie champagne reception before a four-course banquet dinner.
When the extravaganza finishes at 10pm, the engaged couple will host an exclusive after party at their rented £20million townhouse.
A source told The Mirror: “Forget the official opening ceremony, this is the party to be at.
“Angelina is on official work duty but Brad is ensuring fun will be had after hours, and is very hands-on organising the booze-fuelled house party after.”
The pair have opening ceremony seats for London 2012 itself and have been offered tickets for the men’s 100m final.
The insider added: “It’s going to be an Olympics-themed party, with huge buckets of home-made cocktails on offer.
“The who’s who of British and American celebrity will be in attendance, and invitees have been ordered not to take any photos from their phones.”
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