The track, which features vocals from Charlie XCX, was originally released last summer, but it's taken it's time coming to the UK as a single. It finally arrived last week, sending the Swedish duo straight to the top of the charts.
Elsewhere in the singles chart, Robin Thicke and Pharrell Williams' 'Blurred Lines' is at number 2, with Will.I.Am's 'Bang Bang' jumping up to 3rd place from 42nd after 5 weeks in the chart. The Wanted's latest single 'Walks Like Rihanna' has entered at number 4, with Naughty Boy's 'La La La' dropping to 5th place.
In the album chart, Tom Odell has entered at number 1 with his debut 'Long Way Down', with last week's best seller Kanye West's 'Yeezus', being knocked to 6th place. Rod Stewart's 'Time' is back to number 2 after 7 weeks, whilst Michael Buble, Passenger and Jake Bugg make up the rest of the top 5.
Daft Punk remain in the top 10 with 'Random Access Memories', whilst Australian duo 'Empire of the Sun' have entered at 24 with 'Ice on the Dune', scoring their second UK Top 40 album. You can get more detailed information on both charts over on officialcharts.com
This week's top track 'I Love It' is available to download now from ShopTo.