Tis the season to be flashing!

Miley Cyrus shared a very revealing photo on her Twitter page on Saturday, showing her lifting up her shirt to expose her bare breasts -- which she covered up with hearts using an app on her phone.

The 21-year-old is also making her trademark facial expression in the shot, where she's once again seen sticking out her tongue.

"Merry Christmas," she posted along with the pic. "THANK YOU NY for being on of the few states to @freethenipple."

"Free the Nipple" is a campaign started by activists who are "appalled by [the] American media’s glorification of violence and repression of nudity."

Sounds like the perfect cause for Miley, doesn't it? See more of her revealing looks in the gallery above.

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