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NEW YORK (CBSNews.com/AP)-- If Jimmy Fallon had already proven he was a natural hosting NBC's "Late Night," he left no doubt Monday that "The Tonight Show" now fits him like a glove.

As promised during themuch-promoted run-upto his "Tonight Show" debut, Fallon made no drastic changes to the "Late Night" formula that had served him for five years. He remained funny, gracious, bubbly and, above all, comfortable presiding over a show that was different mostly for its earlier time slot, its classier production values and legendary brand name.

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