Ratings: CSI Ties All-Time Low

CSI may have led the 9 o’clock hour in total viewers (with 12.65 million of ’em), but the long-running CBS procedural matched its all-time low rating in the coveted 18-49 demo, scoring just a 2.8.

Also waking up to a bit of bad news this morning: Both NBC’s Community (1.8, down 10 percent)) and ABC’s Grey’s Anatomy (3.85, down 8 percent)) tied season lows, while The CW’s Vampire Diaries (1.2) and Nikita (0.8) both dropped 17 percent in the demos. NBC’s Outsourced slipped 6 percent to a season-low rating of 1.7.

Exclusive First Look: Nikita‘s Mikita, Together!

Want some gooder news? Well… NBC’s Perfect Couples delivered its best retention to date leading out of Community and gained 7 percent in the demos (1.5). Also: Private Practice enjoyed upticks in both audience (7.34 mil) and the demos (2.7).

American Idol Recap: Day One In Hollywood

Elsewhere on Thursday:

* American Idol of course led the night, amassing 21.73 million total viewers and a 7.3 rating — that represents a 3 percent gain over Season 9’s first Hollywood episode. Lead-out Bones was on par with a week ago, drawing 10.07 million viewers and a 3.3 rating.

Exclusive: Bones Boss Weighs In Latest Romantic Twist

* Among scripted shows, The Mentalist was tops in total viewers (14.75 mil), while The Big Bang Theory delivered the best demos (a solid 3.9).

* Although The Office was down week-to-week, lead-out Parks and Recreation was up a smidgen in viewers (to 5.1 mil) and 4 percent in the demos (2.6).

What was playing on your TV this Thursday eve?