Well, it seems like the pictures that some attendee took at the party, and he posted them himself. It looks like a pretty elaborate luau-themed party (complete with the the ladies in sarongs and bikini tops
). I don't know if that necessarily makes it a "very private family affair"....
Actually, it's quite a testament to something (either the integrity of her friends, or something about the way the media works in France, or ???) that these photos didn't get sold to Voici on Aug. 22, 2002, don't you think? Contrast this with Lindsay's 21st, or the intense hype around Hayden Panettiere's 18th.