© @Copyright HELLO! Hello! Magazine Elton John has had reason to celebrate after his and Olly Alexander's cover of It's a Sin hit number one on the Big Top 40. MORE: Elton John's £5million mansion with husband is another worldOlly previously released a slower cover of the classic 1987 song in the run-up to the It's a Sin mini-series, which aired earlier this year, in which he starred.