Robin Thicke’s “Blurred Lines” has not only earned a fourth week atop the UK Singles Chart, it has officially become the second best selling single of the year.

According to The Official Charts Company, the Pharrell and T.I. assisted song has sold over 700,000 copies to date in the UK, trailing only Daft Punk’s “Get Lucky,” which has sold just shy of 1 million copies.

“The cheeky summer anthem, which also features TI and Pharrell Williams, fought off tough competition from Jason Derulo’s The Other Side (Number 2) to retain its position in this week’s race to Number 1. Blurred Lines is now the second biggest selling single of 2013 so far, clocking up a further 133,000 sales over the last seven days, to bring its total combined sales tally to 718,000 copies,” The Official Charts Company reports.

In related news, Jason Derulo has debuted strong on the UK singles chart with “The Other Side,” his latest single.

Released in the UK last week, the song shot straight to no.2 on the chart.