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!

She's just bein' Miley, and sometimes that means wearing a giant hippie flower costume or a down to earth pair of jean shorts and a peasant top. Either way, she's always pushing fashion's boundaries—just like her pop bestie, Ariana Grande, she of tight ponytails, oversize tops and thigh high boots! Who's the most stylish star of 2017 though?

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

Miley Cyrus' Most Outrageous Looks: