Now a mega-model and makeup mogul respectively, the sisters shared a sweet snap of a Christmas long ago.
Taking to her Instagram, 19-year-old Kylie uploaded this adorable Polaroid picture of the sisters on Santa's knee, in 2000.
Sixteen years later, the snap has garnered almost 300,000 likes and comments, as fans gush over the Kardashian-Jenners' cuteness.
However, some fans are slagging Kylie's changed appearance.
One particular dig at the star pokes fun at her inflated lips, photoshopping her new lips onto her young face.
The social media mega-star is probably used to getting slack for her fondness for fillers at this stage, so we doubt this new dig will phase the teen.