A photo of Kylie Jenner posted by her sister

Kim Kardashian on Instagram looks unrecognizable

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In some recent pictures and videos

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the mother of two shows off her post-baby body

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Kim shared the photo of Kylie,

lying on a pool chair with mom Kris Jenner, 66, on her Instagram story

A makeup-free Kylie soaks up the sun in the sun

Kim, stretches out while wearing a sexy two-piece bikini

as she throws her leg over Kylie's lap

In the pool chair, Kris stands with her daughters and a family friend

Shelli Azoff, enjoying its comfort

Shelli's birthday was celebrated on Kylie's Instagram,

in which she wished her a happy birthday.