After 12 years, Carrie Underwood is stepping down as the host of the Country Music Awards (CMA).<br />According to CNN, the country star made the official announcement on Instagram.<br />In her Instagram post, the singer reminisced on wonderful memories with her longtime co-host Brad Paisley.<br />Underwood said that one of the highlights of her career was being on stage with Reba McEntire and Dolly Parton.