Sam Smith and Kim Petras brought their hit song "Unholy" to life in a show ... The song also won the Grammy for best pop duo/group performance, which made for Petras' first Grammy win ever.
The seven-time Grammy winner, 64, surprised fans when she appeared onstage at Sunday's show to introduce Sam Smith and Kim Petras' performance of "Unholy," which won for best pop duo/group ...
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