spoiled rich girl on TikTok, where she raps about her high-school nemeses, bullies the “new girl” and name-checks designer labels like Chanel and Dolce & Gabbana in a sing-song Valley-girl lilt.But the bratty princess persona is far from McKay’s own identity. The 23-year-old social media star grew up in foster care, separated from her siblings and taken away from an abusive household at 9.Bouncing between various homes, she found solace watching escapist teen movies from the 1990s and early 2000s, like “Clueless” and “Legally Blonde.”“I gravitated to those characters … that type of bubbly, successful, confident leading woman,” McKay told The Post.She idolized these sassy, determined ditzes, with their designer wardrobes, doting fathers and the whole world at their well-manicured fingertips. “Part of it was, like, because I loved pink,” she said with a laugh. “But Iooking back now, I think a big part of it was wanting to manifest that kind life for myself.”She has. McKay now makes “millions” of dollars posting content across various media platforms.