From the "navel fetish" entry of Wikipedia:
Renowned singer Madonna in an interview for the May 1985 edition of Spin had said, "My favorite button is my belly button. I have the most perfect belly button: an inny, and there’s no lint in it.When I stick my finger in my belly button, I feel a nerve in the center of my body shoot up my spine. If 100 belly buttons were lined up against a wall, I could definitely pick out which one is mine." Displaying her bare navel during performances became her trademark.
American actor Sal Mineo had a fetish for navels.His partner Courtney Burr had once commented in an interview that he came to know about Sal Mineo's navel fetish. In the book Sal Mineo: A Biography, author Michael Gregg Michaud wrote,"Sal had an insatiable sex appetite."We were physically opposite," Courtney explained, "but we were completely compatible sexually. We'd go at it for the longest time, take a 20-minute break, and do it again. When we had the chance, we'd do it all day. I discovered his fetish for navels. He loved mine. And he had a strange recurring dream that he was being chased and then stabbed in the navel."
British actress Keira Knightley claimed that her navel piercing won her a role in the film Love Actually since its director Richard Curtis was obsessed with her navel.She once commented in an interview,"My mum always wanted it to be my little secret, but it's become a bit of a trademark. Apparently Richard Curtis fell in love with it when he saw BEND IT LIKE BECKHAM. That's how I got to be in his film Love Actually.So when my character got married in Love Actually the wedding dress was designed to expose my bellybutton."
Lisa Donahue, the winner of Big Brother 3 (U.S.) had once commented in the show, "I can orgasm just from my navel being touched the right way" and later in an interview had said,"Many ask if I can really orgasm with my navel..well, no I can't....I just really like my navel played with!!".
Chilean writer Isabel Allende in a chapter on eggs on one of her books had said, "I like a raw egg served on my lover's navel, with chopped onions, salt, pepper, lemon and a drop of Tobasco".
Telugu movie director Raghavendra Rao has a huge fetish for the navel since his movies always have guaranteed navel show of the heroines. He used to include the navel of the heroine in every possible frame and exploit it in song sequences such as dropping of water, flowers, fruits, ice cubes etc., on the navel. Legendary Telugu actor & director Dasari Narayana Rao had once commented, "When you see a heroine slightly removing her pallu to show her inside assets, you don’t feel ashamed of it because of the artistic way in which Ragahvendra Rao projects it on the screen. Especially heroines' navels look most beautiful in his movies".
Credits, MikeBrooklyn.