The 31-year-old singer has designed a collection, called CALIA, for active women who require transitional pieces to take them from running errands to working out.
The range has been created in collaboration with Dick's Sporting Goods, set to be sold exclusively with the US retailer.
The blonde beauty told People magazine, "It has been such a rewarding experience working with Dick's Sporting Goods on all aspects of the design process for CALIA, from choosing fabrics to making sure the look, feel and fit is right for active women.
"The inspiration for this line came from my desire to have clothes that seamlessly take me from workouts, to errands, to rehearsals and beyond."
Carrie, who is currently expecting her first child, a son, with her husband Mike Fisher, hopes her stylish line will inspire and encourage busy women to stay fit and healthy.
She said, "As someone who is passionate about health and fitness, I'm excited to offer women a wardrobe that will move with them and encourage them to stay on the path of leading an active lifestyle."
The "Last Name" hitmaker isn't the first star to try her hand at designing her own range of activewear.
Actress Kate Hudson also launched her own brand of sportswear, Fabletics, last year.