Justin Timbelake proved his ratings prowess, leading NBC’s Saturday Night Live to season highs. Last night’s show, marking Timberlake’s fifth time as host, averaged a 5.9/15 in metered-market households. That was up 23% from last week when Kevin Hart was emcee, and SNL‘s top overnights in 14 months, since January 7, 2012 when the show followed a highly-rated primetime NFL playoff game. In the 25 markets with Local People Meters, last night’s SNL, on which Timberlake also was musical guest, averaged a 3.7/18 in adults 18-49, up 32% from last week and also the show’s highest result in the LPMs since January 7, 2012.