Thursday's ratings snapshot:
American Idol's lucky number was (Top) 13, as it won the night with an audience of 21.24 million total viewers, a 6 percent dip from Wednesday's results show. Survivor placed a distant second with 11.98 mil (down 300K week-to-week), followed by Ugly Betty (slipping 430 thou, to 6.38 mil).
NBC's Earl (5.55 mil) dropped 17 percent from its last fresh outing, while Kath & Kim (4.16 mil) saw a decent gain.
CSI nipped at Idol's heels for best-of-night honors, surging 17 percent to deliver 20.8 million viewers. That's the procedural's biggest draw since Grissom said goodbye. (Um, thanks, Taylor Swift...?) With Grey's taking a knee (and goosed by Idol's overrun), Hell's Kitchen cooked up a second-place finish with 8.63 mil.
The Office (8.63 mil) dipped 270K, while 30 Rock leaped 17 percent to hit 7.35 mil.
Eleventh Hour was No. 1 in viewers (with 12.15 mil, up 420K), while ER (8.789 mil) topped the demos.