OMG! Taylor Swift revealed her belly button!

Taylor Swift has admitted she isn't into the whole bikini thing.

She doesn't mind showing off some midriff but doesn't like to reveal more.

She flat-out said last fall: "I don't like showing my belly button.... I want that to be a mystery."

Right now, she's on vacation in Maui with some galpals - sisters Este, Danielle and Alana Haim of the band Haim - and she poked fun of herself and her fondness for 1950s swimsuits.

But news flash! She showed it off this weekend.

Now that wasn't so hard, was it?

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