The 23-year-old singer is currently in Chicago as part of the KIIS-FM Jingle Ball tour.
In the photo, Selena, who posed with one hand over her head, wore nothing but a tiny black bathing suit, held together by colored straps.
The singer was in full hair and make-up, locks down in a beachy wave hairstyle.
'Comin soon @stevenkleinstudio hehe,' she teased in the photo.
It is not known whether or not Selena has posed for celebrity photographer Steven Klein, though her Instagram snap suggests the possibility.
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