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Carrie Underwood House Sells.

Carrie Underwood is ditching her last remaining tie to “American Idol” — the modest crib she bought in Tennessee to celebrate winning the crown in 2005.

Now that Carrie’s a bonafide country music multi-millionaire … she just sold off the 2,956-square-foot home in Franklin, TN (Google it … tons of celebs live there) for $372,500.

The country superstar bought the 3-bedroom, 3.5-bath house for $384k … ya know BEFORE she sold over 15 million albums and married a pro hockey star.

The house is pretty great — for a non-famous person — hardwood floors, spacious kitchen, garage, fireplace … all that normal house stuff.

Carrie’s far from homeless — she and husband Mike Fisher dropped $3.2 million on 400 acres of land in nearby Nashville back in 2011 to build their dream home.

‘Cause they’re moving on up …