Kristian Konstantinov Kostov is a Bulgarian-Russian singer. He was a finalist in season one of The Voice Kids Russia and a runner-up in the fourth season of X Factor Bulgaria. He represented Bulgaria in the Eurovision Song Contest 2017 with the song "Beautiful Mess", finishing in second place. In January 2018, Kostov won the EBBA Public Choice award. In January 2019, he was one of seven singers who performed in the seventh season of Singer.

"Beautiful Mess" is a song performed by Bulgarian-Russian-Kazakh singer Kristian Kostov. The song was released as a digital download on 13 March 2017 through Virginia Records. The song represented Bulgaria in the Eurovision Song Contest 2017 in Kyiv, Ukraine. Beautiful Mess was performed as Kostov's first song on Singer 2019.