Soon after she was offered a record deal at the age of fifteen , and in 1998 became the youngest artist ever to start at number one in the UK Singles Chart with `` Because We Want To '' , released under the artist name `` Billie '' . Piper was offered a record deal at the age of fifteen , and in 1998 became the youngest artist ever to debut at number one in the UK singles chart with `` Because We Want To '' , released under the stage mononym `` Billie '' .