Miley Cyrus is officially back in her “Can’t Be Tamed” era and we’re so here for it. Yesterday on Instagram, the “Flowers” singer, 30, debuted her new brunette hairstyle. In the photo slideshow, Cyrus instantly transports us back to 2010 with her dark brown locks, posing in a black coat with a red designer bag in hand. (FYI: The last time Cyrus rocked dark brunette hair was during her “Can’t Be Tamed” album release, which happened before the singer transitioned to her iconic pixie cut.) In the c