Bruno Mars scores an impressive fourth Hit Predictor this week, at Mainstream AC, for "Young Girls." It was a HitPredictor at Top 40 on Dec. 9, Hot AC on Jan. 6 and Rhythmic last week. Joining Bruno as an AC HitPredictor this week is One Direction with "Story of My Life." It may become the band's biggest radio hit since their debut single, "What Makes You Beautiful," in 2012. "Story" is already top 10 at both Top 40 and Hot AC, and now it's crossing to Mainstream AC.