American Idol, Adam Lambert

Michael Becker / Fox

That's life, as Frank Sinatra would've sung.

A Rat Pack-celebrating American Idol ruled Tuesday with 22.5 million viewers, per preliminary Nielsen estimates, but lost about 1.5 million fans from last week as NCIS returned with an all-new episode—not to mention Chris O'Donnell and LL Cool J.

Elsewhere in last night's ratings:

At 9 p.m., The Mentalist (16.9 million) was even bigger than NCIS (16.3 million) was at 8 p.m. Still, the Chuck Wicks-eliminating Dancing With the Stars (14.3 million) held up OK, while Fringe (10.6 million) went even more mainstream.

At 10 p.m., Law & Order: SVU (10.5 million) killed among adults 18-49. Earlier, the CW's Reaper (1.8 million) and 90210 (1.8 million) plain got killed.

Counting down to its own finale, The Biggest Loser (9.4 million) scored its biggest audience in nearly three months, per NBC.

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