Hilary Duff's metamorphosis from Disney Channel star to mature pop force happened in public—and produced a clutch of captivating pop songs. Early hits like the strutting “So Yesterday” and the sinewy “Come Clean” balanced Duff's youthful charm with wise-beyond-her-years pop savvy, a combination that became even more potent on the crunchy “With Love”. She shook off her teen-idol identity during the mid-‘10s, with the glittery “Breathe In. Breathe Out.” and the playful “Sparks” cementing her status as a pop star for all ages.