Kacey Musgraves Performs a Beautiful Cover of Coldplay's 'Yellow' For English Royalty

Kacey Musgraves was in London last month and channeled Cinderella when the self-proclaimed "Dime Store Cowgirl" found herself performing in front of a prince. The Pageant Material singer was on the bill for the U.K.'s Royal Variety Performance for charity along with Elton John and Kylie Minogue, and once again played her stirring cover of Coldplay's 2000 single, "Yellow." Musgraves posted Instagrams about…