James Hibberd
May 20, 2011 AT 03:19 PM EDT

Nine season finales aired Thursday night and NBC’s one-hour celebrity-stuffed The Office closer came out on top.

The Office delivered 7.1 million viewers and a 3.8 preliminary rating among the adults 18-49 demographic, rising 12 percent from its finale last year (and only had to cast half of Hollywood to do it!). That beat the finales for Fox’s Bones (10 million, 3.2) ABC’s Grey’s Anatomy (9.6 million, 3.4) and CBS’ two-hour Red John showdown on The Mentalist (13.7 million, 2.7).

The Office was the only finale to post an increase compared to last year’s closer, though. Most ranged from being down a mild 9 percent (Parks & Recreation) to a steep 37 percent (Grey’s Anatomy).

Overall Fox won the night with American Idol (21.2 million, 6.2) ranking as the night’s highest-rated show.

CBS was second with finales for Big Bang Theory (11.1 million, 3.5) and Rules of Engagement (8.8 million, 2.5) leading into Mentalist.

ABC also had closers for Wipeout (5.6 million, 1.7) and Private Practice (7.5 million, 2.5). You know, ABC has been leaning more heavily on Wipeout, which started as just a summer show and now seems to be on every week to fill holes in ABC’s schedule. As a result, the series has taken a ratings tumble this year.

Though The Office was stretched to an hour and was the night’s top-rated scripted show, NBC was in fourth, thanks to repeats at 8 p.m. Back-to-back finale episodes of Parks & Recreation (3.9 million, 2.2) filled 10 p.m.

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