Has the update novelty already worn off? Although 90210 helped spawn a reboot of Melrose Place, the teen drama - already renewed for another season - is starting to show signs of weakness. Yesterday’s episode drew in its smallest audience to date.

8pm

• American Idol (22.5 million, 7.9/22 in 18-49) was out of tune by 700,000.
• NCIS (16.3 million, 3.4/10) improved by 400,000.
• The Biggest Loser: Couples (9.4 million, 3.6/10) was up a tick.
• According to Jim (3.5 million, 1.0/3) slid by 200,000.
• Reaper (1.8 million, 0.7/2) dropped 700,000.

9pm

• The Mentalist (13.7/9 in 18-49) scored 16.9 million.
• Dancing with the Stars (14.3 million, 3.2/8) lost 200,000.
• Fringe (10.6 million, 4.2/10) picked up 100,000.
• 90210 (1.8 million, 0.9/2) fell by 400,000.

10pm

• Without a Trace (2.5/7 in 18-49) rung up 12.4 million.
• Law & Order: SVU (10.5 million, 3.9/11) added on 3.4 million.
• Cupid (6.2 million, 1.7/5) did about the same as The Unusuals.

*denotes repeat

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