The duo — alongside rap funsters Far East Movement — managed to hold off the challenge of Macklemore & Ryan Lewis with 'Thrift Shop', which 'rocketed' 22 places to Number 2.
The rest of the Top 40 features some people going up as well as some people going down and there are only two new entries — Devlin at Number 10 with 'Rewind' and Disclosure featuring AlunaGeorge are new at 28 with 'White Noise', despite the song only being released on Friday.
On the album chart there's a new entry at Number One for Matt Cardle songwriters Biffy Clyro, whose album 'Opposites' becomes their first 'chart topper' in six attempts. GUITAR MUSIC IS BACK etc etc.
Elsewhere in the Top 10 Justin Bieber's acoustic version of 'Believe', ie 'Believe Acoustic', enters at Number 5, while Ellie Goulding's 'Halcyon' re-enters the 'upper echelons' at Number 10.