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Who will cheer on Prince William and bride Kate Middleton inside Westminster Abbey on April 29 of next year?

The latest Us Weekly has new details on the wedding of the century -- including the guest list. While a St. James Palace spokesman tells Us "the invitations won't go out until early 2011," a source offers a sneak peek at some of the notables.

"You can expect the Obamas," says the source, adding that David and Victoria Beckham plus Sir Paul McCartney are also on the list. One famous (former) British royal, however, will not get the coveted invitation: "Sarah Ferguson will not be invited," the source says of Prince Andrew's ex-wife.

And while Simon Cowell has suggested that Susan Boyle sing the 28-year-old couple down the aisle, the insider shoots down that possibility, quipping, "They don't want this to become X Factor."

For more on the royal wedding -- including Middleton's surefire maid of honor, when she'll start cake-tasting and how Prince Harry will be by his brother's side weeks before the big day -- pick up the new Us Weekly, out today!