Stardust is an unreleased song performed by Kerli, leaked in the second quarter of 2018. It was written by Kerli herself along with Svante Clas Halldin and Jakob Gustav Hazell, therefore is an Utopia outtake.
Originally believed to be a demo for the tyDi song with the same name, Stardust was traded for some time before being leaked around April or May 2018 through VK. However, this leak was not acknowledged to exist, until a YouTube user posted the song on January 15, 2019, and shared it through different social networks and forums.
Since the lyrics are completely different than the tyDi song with the same name, and the song was written by Kerli and SeventyEight, it is completely true that this is not a demo for the tyDi and Kerli song released for free in 2014, but an outtake of the early Utopia sessions, when the EP was still considered a full-length album. Stardust did not make the cut for the final 12-song track listing.