Didn't see this posted here. It's from one of those reddit "Ask Me Anythings" with celebs that occasionally reveal interesting things like this. I've isolated the link to just that bit (whole thing is a massive Q&A session) and the actual text of the question and answer is below so you don't even have to click.
http://www.reddit.com/r/IAmA/comments/2cwdyj/kiesza_here_ama/cjjnl1r
Q: Where are you the mos ticklish?
[–]KieszaOfficial
In my belly button, ears, behind the knees and feet!
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Thanks for sharing them here. 
