Hey NBC - primetime might actually survive in the post-Jay Leno world after all. Last night’s arrival of Jim and Pam’s baby on The Office delivered something the network hadn’t seen before, a victory over Grey’s Anatomy in the demos. That one-hour special lead into another nice win for the network. The Marriage Ref‘s time slot debut also defeated the competition in the 18-49s.

8pm

• American Idol (19.3 million, 6.5/19 in 18-49) still had the best numbers of the evening.
• Survivor (12.7 million, 3.8/11) picked up 1.2 million more.
• Community (2.3/7) kicked off the night with 5.1 million.
• A Grey’s Anatomy* repeat (1.2/3) turned in 5 million.
• Parks and Recreation (4.6 million, 2.3/6) lost part of its lead-in.
• The Vampire Diaries* (0.7/2) checked in 1.7 million.

9pm

• CSI (3.7/10 in 18-49) analyzed 15.6 million.
• Grey’s Anatomy (4.0/11) pulled in 11.8 million.
• Approximately 9 million witnessed the arrival of Cecelia Halpert on The Office (4.7/12).
• Kitchen Nightmares (8.1 million, 3.3/9) cooked up 400,000 more.
• Supernatural* (1.5 million, 0.6/2) did the same.

10pm

• The Mentalist (14.8 million, 3.2/9 in 18-49) won the hour in viewers.
• The Marriage Ref (3.4/10) had 7.7 million debating.
• Private Practice (2.7/8) rounded up 7.7 million.

*denotes repeat

(You can review last Thursday’s ratings here.)