Kristian Kostov

On 5 May 2019, Kostov witnessed the accident involving Aeroflot Flight 1492 at Sheremetyevo International Airport, Moscow, Russia.

On 4 January 2019 (episode airing on 11 January 2019), the seventh season of China's long-running singing competition Singer (which was also called I Am a Singer before 2017) began taping, and Kostov was revealed as the last of the seven first-round performers competing this season, which cast also consist of veteran Chinese singers Liu Huan, Chyi Yu, Yang Kun, Wu Tsing-fong (of the band Sodagreen), Zhang Xin, and Escape Plan; all seven singers carries an exemption of participating in the Breakouts and will automatically qualify for the finals if they survived elimination for the entire 11 weeks of performances. At age 18 at the time of the taping, Kostov was also the youngest contestant in Singer 's history, and the first ever contestant born in the 21 century. Kostov was eliminated from the competition on week six (2nd Challenge Round), but was however eligible to participate in the Breakout round (due to be held after the 4th Knockout Round, on March 29), to reinstate him from the competition and compete in the finals.

At the age of five, Kostov began singing and playing the piano, because he was very shy and needed to open up a little. By that time he joined Moscow-based vocal group "Neposedi", which has also gathered Russian duet t.A.T.u. for the first time. Around the same time, he was struggling with muscular dystrophy, which he revealed in a YouTube video in 2017.

On 18 November 2017, he performed during the final of Miss World 2017 in Sanya, China. Later on 17 January, Kostov won an EBBA Award, which is an award for young artist in Europe with most success out of their own country. He also won the Public's Choice Award.

On 7 October 2016, his debut single "Ne si za men" was released by Virginia Records. The song was written by Venci Venc' and music and arrangement by Ray Hedges, Nigel Butler and Isaac Evans. The song peaked to number 13 on the Bulgarian Singles Chart. He featured on Pavell & Venci Venc's single "Vdigam Level". The song was released on 25 November 2016, and peaked to number 13 on the Bulgarian Singles Chart. On 13 March 2017, it was announced that he would represent Bulgaria in the Eurovision Song Contest 2017, with the song "Beautiful Mess". He is the first singer at Eurovision to have been born in the 2000s decade. He finished second in the contest, which was a new best result for Bulgaria, since the 2016 contest, where Poli Genova finished 4th.

In 2011, Kostov left Neposedi in order to concentrate on his solo career. In 2012, Kostov represented Bulgaria in the junior version of New Wave, an international contest for young performers of popular music.

Kristian Konstantinov Kostov (Bulgarian: Кристиан Константинов Костов , Russian: Кристиа́н Константи́нов Ко́стов ; born 15 March 2000) 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 2nd place. In January 2018, Kostov won the EBBA Public Choice award. In January 2019, Kostov was one of seven first batch singers who would be performing in the seventh season of Hunan Television's singing reality-competition Singer (previously I Am a Singer).