Katy Perry has her first hit at Urban radio this week. "Dark Horse," aided by Juicy J, is her first HitPredictor at Urban; it already won at Mainstream Top 40, Rhythmic, Hot AC and Mainstream AC. Justin Timberlake scores his third HitPredictor this week for "Not a Bad Thing," at Rhythmic. He won 3 weeks ago at Mainstream Top 40 and last week at Hot AC. And Christina Perri's "Human" nabs its second HitPredictor, at Top 40, after winning at Hot AC back on Dec. 3.