A photo of Kylie Jenner posted by her sister  

 Kim Kardashian on Instagram looks unrecognizable

In some recent pictures and videos

the mother of two shows off her post-baby body

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.