Fashion Roundup: Nastia Liukin To Launch Denim Line; Target Pops Up; Isaac Mizrahi's New Collection

Olympic gold medalist Nastia Liukin will launch her own brand of jeans and attend New York fashion week with Maria Sharapova. [WWD]

Target will open four pop-up stores in New York this week--in Midtown, Union Square, SoHo and the East Village--where shoppers will be able to buy designs by Sigerson Morrison, Jonathan Saunders and Anya Hindmarch weeks before they arrive in stores. [Vogue UK]

Meanwhile, here's a slideshow of Mr. Saunders' collection for Target. [The Cut] 

Isaac Mizrahi's collection for Liz Clairborne has leaked. [WWD] 

Vivienne Westwood has recorded a music album. [Vogue UK] 

Gen Art will make select looks by  JF and Son, one of its labels, available on Yoox.com one day after the garments are sent down the runway in its 14th annual Fresh Faces show. [WWD]