The 32-year-old's previous posts included a shot of her receiving a face massage while on Facetime and a throwback picture of her sitting at a desk in a sports bra.
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The researchers used data from peer-reviewed studies and health databases to assess the link between the age of first menstruation and patterns of sexual and reproductive health in girls in lower-income regions of the world.
Their findings were 'similar to what has been observed in high-income countries such as the US', they note.
The singer oozed sex appeal as her best assets threatened to pop out of the dangerously low-cut top as she smouldered at the camera.
She flaunted her toned stomach and lean limbs in a pair of tiny shorts which were left unbuttoned further emphasising her trim waist.