Yet, here is a much nicer place, the blank mid-torso of a skinny pretty woman who's done nothing more evil than prancing about in a bra and underpants. It's an interesting mystery. It's not like we know Kurkova left her navel on some battlefield in Europe (or Albert Hall).
Some have no belly button as a result of the surgery needed to correct abdominal problems at birth, often either an umbilical hernia, or a condition known as gastroschisis - born with the stomach and intestines poking through a hole in the abdominal wall.I know all about that, having watched the "Hottest Chick, Ugliest Scar" episode of the Howard Stern Show. (It's "Megan" at the link, which has photos of women in bikinis.)
Bonus religious question: Did Adam and Eve have navels?