via CBS press release (note, this was not a high for adults 18-49, the previous high in the overnights for that was a 2.9 rating, which rose to a 3.0 in the final numbers):
"BIG BROTHER 11" SOARS TO NEW RATINGS HIGH
Last Night's Live Eviction Broadcast Delivers "Big Brother 11's" Largest Audience on Any Night This Summer
"Big Brother 11" Also Posts Its Highest Thursday Adult 18-49 and
Adult 25-54 Ratings
BIG BROTHER 11 THURSDAY, which last night saw the live eviction of Russell Kairouz, delivered its largest audience of the summer on any night, according to Nielsen preliminary live plus same day ratings for Aug. 27.
BIG BROTHER 11 THURSDAY was first in households (5.0/09), viewers (8.08m), adults 25-54 (3.3/10), adults 18-49 (2.7/09) and tied for first in adults 18-34 (2.0/08, with FOX).
Compared to last week, BIG BROTHER 11 THURSDAY was up +16% in households (from 4.3/08), +18% in both adults 25-54 (from 2.8/09) and adults 18-34 (from 1.7/07), +23% in adults 18-49 (from 2.2/08) and added +1.33m viewers (from 6.75m, +20%).
This is BIG BROTHER 11's best delivery (on any night) in both households and viewers and best Thursday delivery in adults 25-54 and adults 18-49.
Updated Thursday ratings will be available this afternoon.