Pharrell Williams‘ ‘Happy‘ has become only the fourth single to go triple platinum in the UK in the past 20 years. The song has sold 1.8 million copies and joins the elite crew of Will Young’s ‘Evergreen‘, Aqua’s ‘Barbie Girl’ and Elton John’s ‘Candle In The Wind 1997‘. ‘Happy‘ is currently spending its 35th week in the UK singles chart after claiming the number one spot back in December.