Lucas Robert Hemmings is an Australian, 18 year old from the band 5 Seconds Of Summer. He plays guitar and sings lead vocals in the band. He started out by posting phenomenal covers of songs on his YouTube channel, hemmo1996 in 2010. Later, Calum Hood and Michael Clifford joined. In 2011, Ashton Irwin joined Luke to form 5 Seconds Of Summer.