As Fashionista pointed out, though, Jenner's actually been teasing the news on social media for weeks now: If you peep through her feed, you'll find some subtle throwbacks to some of her late '90s and early aughts Adidas #OOTDs. (The Kardashian-Jenners have always been about #fulllooks, after all.) "Always been an OG," one caption reads; "whyyyyy mom?!," the model asks on an image of her and Kylie coordinated tracksuits.