Tom Cruise is the Most Powerful Celebrity In Tinsetown. The 45-year-olf Valkyrie star is featured on the January 2009 cover of Details Magazine and is top-ranked celebrity — and #7 overall —on the publication’s Annual Power 40 list of men who have the ability to impact America.

Who came up with this list again?

Also featured on this year’s Power 40 listing are President-Elect Barack Obama, womanizing musician John Mayer, and the two sons of Alaska Governor Sarah Palin.

At any rate, you can check out Tom’s profile and the full Power 40 here.

Details January 2009 arrives on newsstands December 2.