As I ascend the steps of Miu Miu 's 57th Street flagship to preview Joey King 's Miu Miu Select Collection—her limited-edition curation of L’Eté clothing, bags, shoes, and more—I'm not sure I count as a quote-unquote " Miu Miu girl." I'm eight months pregnant and rotating through an ever-dwindling pile of maternity clothes . In my rush to make it to our interview on time, I walked right past the Miu Miu flats I’d carefully placed by the front door for this exact occasion. An It bag or teeny-tiny pleated skirt to blend in with the editors and influencers milling around the powder-blue jewel box of a store? Not exactly items I had on hand. But barely seconds into meeting the night's host, I learn membership in one of fashion's favorite clubs is only partially about what you're wearing. With a "Stop, you're the cutest!" and a quick, hug-filled introduction to "My friend, AnnaSophia!" (as in, fellow actress AnnaSophia Robb), Joey King assures me that anyone can gain entry to the Miu Miu girl ranks.…