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Taylor Swift is explaining why she finally decided to share with the world what her belly button looks like.

For while there, we were beginning to wonder if she even had a belly button. But as you'll recall, T-Swift shared a glorious bikini shot while on vacation in Hawaii with HAIM, finally revealing that her belly button does indeed exist.

Greetings from Maui! @haimtheband

A photo posted by Taylor Swift (@taylorswift) on

So, after all the crop tops Taylor has worn over the past few years ... why now? What made her finally reveal her belly button? Tay tells all during an interview on BBC Radio's "Breakfast Show with Nick Grimshaw" ... and it has to do with the paparazzi. Taylor explains:

"Basically, on the last day [of their vacation] we see a fishing boat a half a mile away. We were like, 'That’s a little weird. We're in the middle of the ocean scuba diving.' My security gets out binoculars and sees that they have a huge long-lens camera. At which point, we go back to the beach and we realize, 'Okay so they got pictures of us in our bikinis, like I don't want them to make like $100,000 for stalking us' ... So we're like, 'Get up on the bow of the boat, we're taking better bikini shots, so they don't make as much money on theirs.'"

T-Swizzle: 1, Paparazzi: 0

Taylor also reveals why she's so secretive about her belly button in the first place.

"I don't like showing my belly button ... I don't want people to know if I have one or not. I want that to be a mystery ... It could be pierced. They have no idea. If I'm going to get some sort of massive tattoo, it's going to be right next to my belly button because no one's ever going to see that."

Check out the interview below. She talks about revealing her belly button at around 7:40.

Photo: Getty Images