Carrie Underwood [1] is one hot mama [2]! On Sunday, the country singer made her way to the MGM Grand Garden Arena in Las Vegas for the annual ACM Awards. Upon her arrival, Carrie turned heads in a sheer, beaded number [3] and struck a handful of poses for photographers on the red carpet. Carrie also took the stage for an amazing performance and was spotted mingling with Keith Urban [4] backstage. Read on for more of Carrie's night, and then check out this sweet family moment [5] she shared with her husband and son last month.