Here's an improved version of that picture.
http://www.imagebam.com/image/b5543c372270311
I found out this is from 2013, so she's still refusing to give her bellybutton any air. Really hoping her roommate, Karlie Kloss, takes a pair of scissors to the waistlines of all her clothes.
PS: If I was that guy in the pool, I would go straight after that bellybutton the first chance I get and tell Taylor "Sorry, I couldn't help myself. I HAD to do that."