Cyrus took the centre stage during the final of the singing reality show on Tuesday to perform a rendition of her new single Malibu.
She took a moment to dedicate the performance to the people who were killed in the attack.
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"I want to dedicate this song to my good friend Ariana Grande and everyone who experienced that horrific attack yesterday. Our hearts are with you," Cyrus said.
Watch the video here:
https://www.youtube.com/watch?time_continue=1&v=kiNRCy5LLUQ
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