Silambarasan Thesingu Rajendar (born 3 February 1983), also known as Simbu or S. T. R., is an Indian film actor, director, playback singer and lyricist of the Tamil film industry. He began his career by playing roles as a child artist in films directed by his father T. Rajendar,before essaying his first lead role in Kadhal Azhivathillai (2002), under his father’s direction as well and produced by his mother Usha Rajender.