LeAnn Rimes jetted off to Nashville to host The 30th annual Texaco Country Showdown, and the country cutie couldn't help but flaunt her sexy legs. We're lovin' those Louboutins!

The event is billed as America's largest country music talent search with a $100,000 prize at stake ... along with the title, “Best New Act in Country Music.”

Eddie Cibrian's wifey also performed for the Tennessee crowd. Talk about a lucky audience!

The "How Do I Live" singer will resume her tour this Saturday ... performing at the Bass Performance Hall in Fort Worth, Texas.

Click thru to see LeAnn posing alongside a country legend.