Carrie Underwood is known for her love of ball gowns but she kicked it with simple black leggings and a very special tee to team up with Miranda Lambert to raise awareness and support for kids with cancer.MORE: Miranda Lambert's love story with husband Brendan Loughlin is like something from a movie The country stars were among a group of singers who have joined the campaign for St.
Jude Children's Research Hospital this holiday season.WATCH: Carrie Underwood's Christmas in Rockefeller Center performanceCarrie wore her blonde hair super straight as she smiled in a pair of black leggings, and the grey crew-neck tee which reads "Love Music Stop Cancer."Miranda was joined by her fellow Pistol Annies' stars Ashley Monroe and Angaleena.
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