Brie had a Q&A on their Youtube channel, pretty sure these happen weekly. She answers where she's ticklish pretty much exactly at the 15:00 mark. Goes into pretty good detail, too.
https://youtu.be/WnQby37rMno
That's 2/2 Bella Twins!
https://youtu.be/WnQby37rMno
That's 2/2 Bella Twins!