Kourtney Kardashian wowed her Instagram followers once again this week when she shared a never-before-seen throwback photo. MORE: Kourtney Kardashian reveals the secret to her glowing skin in a dazzling gold bikiniThe 41-year-old Keeping Up With The Kardashians star posted a photo of herself from 2000 – and she hasn't aged one bit!In the post, a then 20-year-old Kourtney can be seen showing off her petite frame in a matching cheetah print tank top and briefs.