03/18/2010 05:12 am ET | Updated May 25, 2011

Diane Sawyer's Rihanna Interview Brings "20/20" Huge Ratings

Diane Sawyer's interview of Rihanna on Friday's "20/20" was a ratings hit and enough to lift ABC to first in the Adults 18-49 demographic for the night.

"20/20" averaged 8.2 million total viewers — its biggest audience in over 7 months — and garnered a 2.7 A18-49 rating (9 share). Also, its 2.7 A14-34 rating was the show's best since December 2006. The show also added 3.4 million total viewers from its lead-in.

The New York Post called Sawyer's Rihanna interview "what may be one of the last, big-time celeb rity interviews she does before taking over as anchor of ABC's evening newscast."