By Breaking Celebrity News Staff

LeAnn Rimes -- as only LeAnn can -- jumped on a treadmill in her skinny jeans and sky-high stilettos Saturday, and Breaking Celebrity News has the photos.

The country singer and her husband, Eddie Cibrian considered attending the opening of the first Signature LA Fitness Club, and LeAnn couldn't help but showing off.

She jumped on a treadmill and actually jogged.

Afterwards, Rimes tweeted (of course).  "Had the best time at the opening of the new @LAFitness in our neighborhood Fabulous!!!!"