Saturday Night Live hosted by Katy Perry with musical guest Robyn averaged a 2.7 rating with adults 18-49 in the 25 markets with Local People Meters. In the metered-market ratings last night's SNL averaged a 4.8 household rating /11 share.
Both of those numbers are identical to the preliminary ratings for last Saturday's SNL which was hosted by Steve Buscemi with musical guest The Black Keys
