Between back to school shopping and fashion week, September is truly the month of fashion reinventions and celebrating personal style—and who are more stylish than our resident reigning pop stars?

PopCrush Best Dressed is a month-long competition to determine the ultimate style stars of 2017!

Up first is K-pop's fierce baddest female CL, former star of 2NE1 and eternal muse of designer-to-the-pop-stars Jeremy Scott. In Round 1, she's up against bad gal RiRi, a fellow international style icon and slayer of all things Met Gala related. But who's the baddest (and most fashionable) of them all?

The battle begins right now! Place your vote between CL and Rihanna for 2017’s Best Dressed! Round 1 ends Monday, September 18 at 11:59 p.m. EST.

CL's Most Gorgeous Instagram Photos: