The French duo's collaboration with Pharrell Williams and Nile Rodgers sold a further 114,000 copies this week, already becoming the second biggest-selling single of 2013 so far.
It is now just 19,000 copies behind Macklemore and Ryan Lewis's 'Thrift Shop'.
Passenger climbs for a seventh week in a row to two with 'Let Her Go', while X Factor USA judge Demi Lovato scores her biggest single in the UK so far with 'Heart Attack' at three.
Macklemore and Ryan Lewis climb back up a place to four with 'Can't Hold Us', swapping places with Rudimental's 'Waiting All Night'.
Wretch 32 earns his fourth UK Top 10 single, with 'Blackout' landing at six. Chris Malinchak's 'So Good To Me' falls five to seven.
Armin van Buuren slips two to eight with 'This Is What it Feels Like', followed by David Guetta at nine with 'Play Hard'.
Sub Focus land at ten with Alex Clare team-up 'Endorphins'.
Stooshe secure their third top 20 single in a row, as 'Slip' enters at 12. Singer-songwriter Tich has a Top 40 debut at 23 with 'Dumb'.
Olly Murs leaps 83 places to 18 with his latest single 'Dear Darlin'.
Mariah Carey climbs 12 places to 27 with 'Beautiful', while John Legend's 2004 hit 'Ordinary People' is up six to 30.
Birdy has a re-entry at 36 with 'People Help the People', followed by Gabrielle Aplin's 'Please Don't Say You Love Me' at 38.
Listen to 'Get Lucky' below:
Source: Official Charts Company
> This week's albums chart