Back to You by Carin Baer/Fox Back to You by Carin Baer/Fox

Fox led again in Tuesday ratings, with another expanded Idol, among other hot eps. The numbers, from preliminary Nielsen figures:

On Fox, American Idol's 90-minute singathon with the top 10 guys enjoyed 28.4 million viewers from 8 pm to 9:30. Back to You, which piggybacked the ep, laughed up its season ratings high with 12.3 mil overall (with viewers 18-49).

On NBC, Biggest Loser was the next biggest winner on ratings after Fox from 8 pm to 10 pm, with 8.1 mil overall. Quarterlife, meanwhile, lagged with 3.9 mil overall for its broadcast premiere. The show moves to Sundays (9 pm) from now on.

CBS was up week-to-week with Big Brother at 9 pm (6.7 mil) and Jericho (6.9 mil). ABC trailed behind with According to Jim at 9 pm (4.6 mil), with a little boost from Primetime: What Would You Do? at 10, which 7.6 mil viewers tuned in for. The CW's One Tree Hill at 9 pm scored 3.2 mil overall. - Anna Dimond