See Kim and Kourtney Kardashian's Adorable Throwback Thursday Bikini Pic

Expectant mother posted the adroable photo on her Instagram

It's Throwback Thursday!

Kim Kardashian posted an absolutely adorable snap of her with sister Kourtney Kardashian in bathing suits as toddlers.

The expectant mother captioned the pic on Instagram with, "#throwbackthursday me & @kourtneykardash fun in the sun! #bikinibabe"

Little Kim looked positively precious in a silver two-piece while holding hands with her older sister.

Kourtney made a funny face while posing in her blue-and-white striped one-piece swimsuit.

What a flashback!

A new season of Keeping Up With the Kardashians premieres June 2 at 9 p.m., only on E!