Before the world was experiencing Kardashian overload ... Kim and Kourtney Kardashian were just two cute (normal?) kids from the Valley!

On Thursday, Kim tweeted the adorable vintage snap of her and Kourt sporting matching "K" sweatshirts with the caption, "#tbt KK @kourtneykardash."

It's hard to believe that the Kardashian sisters were once so innocent -- before the infamous sex tape, wild partying and endless bikini shots.

Khloe Kardashian is noticeably missing form the cute candid. Maybe Khlo's the one who snapped the pic for them?

It also looks like the 32-year-old's always been a fan of "going glam" --  Kim's even wearing makeup in the childhood pic.

Click "Launch Gallery" above to see more stars before fame!

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