He's the background dancer for the swedish Melodifestivalen, the show we have to select which song to send to Eurovision. He have been a dancer for a few years now and yeh, totally adorable!
He also was a background GoGo-style dancer during the "Love Love Peace Peace" act when Sweden was hosting Eurovision in 2016. Whole song is worth a listen as it is kinda funny, but linked to the timestamp when he first start to dance in the background.