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Troye Sivan performs 'Youth' live on Ellen.

Troye Sivan gave a performance of his new single 'Youth' on today's episode of 'The Ellen DeGeneres Show'. Accompanied on keys and backing-vocals by Allie X - the song's co-writer and one of our top picks for big things in 2016 - Troye performed the song in a super cool Moon-landing-themed bomber jacket.

Introducing the track, Ellen exclaimed, "Happy birthday to me, because I love him so much," as the show was taped the day following her 58th birthday. Troye seemed to enjoy his time on the show too, tweeting "GUUUUUUYS MY BRAIN IS MUSH RIGHT NOW" on his drive back from the Los Angeles studio.

You can watch the performance below...