ABC News -- ABC NEWS' Yunji de Nies Reports:It may be a school night, but the First Tweens are staying up late. Michelle Obama took her daughters to a Miley Cyrus concert at the Verizon Center this evening. Its not the first time Malia and Sasha have seen the teen queen, whose hit "Party in the U.S.A." reached number one on the Billboard Pop 100 chart last Friday. On Inauguration Day, the girls and the First Lady attended the Kids Ball, where Miley Cyrus performed. Earlier this summer, Mrs. Obama also took her daughters to a Beyonce concert at the same venue. The First Tweens have also had a chance to meet some of their favorite teen idols in person. On Inauguration night, while their parents took in 10 balls, the girls went on a scavenger hunt to...