Cruise once said supposedly when he was married to Kidman, that Kidman "Loves to be tickled" I dont know if that was just heresy, or an actual quote
I believe it was in an episode of the show Hope and Faith that Ripa was on, I can remember Ripa getting tickled in that show, but I dont remember the exact circumstances.
Besides those two, I have not heard anything else of any celebrities being interested in tickling, but of course we never know who might be, that is just keeping it to themselves or out of public knowledge lol.