SHANIA Twain has stripped down to her underwear to celebrate her milestone 60 th birthday.

The singing icon took to Instagram on Thursday to share a picture of herself wearing nothing but a loosely buttoned white shirt and black underwear to commemorate the occasion of her birthday.

In the snap , Shania, proves age is just a number as she rests her hand on top of her head and looks seductively at the camera.

Her hair is tied up from the back and in loose waves and she’s wearing a full face of make up complete with eyeliner, lip gloss and blush.

Lyrics to her legendary 90s song, Man! I Feel Like A Woman are sprawled out across the photo as it says: “No inhibitions, make no conditions/Get a little out of line.”

She also shared a picture of her younger self from the 80s, wearing

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