Initial reports suggested the prince and Catherine, the Duchess of Cambridge would only meet little-known, up-and-coming stars at the Brits to Watch bash on Saturday (09Jul11) in Los Angeles.
And the party looked like a flop when William's celebrity pal David Beckham revealed he wouldn't be able to make the get together.
But now E! Online blogger Marc Malkin reveals the party will be a big deal after all.
Lopez and her husband Marc Anthony will attend, as will movie heavyweights Kidman and Hanks.
Kristin Chenoweth, dancer Derek Hough and actresses Ginnifer Goodwin and Dana Delany are also on the guest list for the soiree at the Belasco Theater in downtown Los Angeles.