Carrie Underwood performed on the "Today" show this morning with a new band -- her wedding band!

Carrie Underwood Wedding Ring
Gone is the gorgeous yellow engagement ring she was sporting before her wedding to Mike Fisher earlier this month -- and instead, she's rocking some sparkling white diamonds.

Between performances, Carrie told Matt Lauer "[Married life] is a lot like dating life" ... yeah, with flashier bling!

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