The Xtra Factor co-host's collaboration with Flo Rida stays at the top of the charts for a second week, seeing him achieve a chart double by also topping the album chart with Right Place, Right Time.
Bruno Mars settles for the runner-up spot for the second time in three weeks, after his X Factor appearance sees him rise seven places with 'Locked Out of Heaven'.
Rihanna also scores a similar leap after her own X Factor performance, with former number one 'Diamonds' climbing seven spots to three.
Labrinth stays in the top five, with his Emeli Sandé duet 'Beneath Your Beautiful' a non-mover at four. Alicia Keys is also a non-mover at five with 'Girl on Fire'.
Ke$ha returns with new single 'Die Young' landing at ten, her third UK solo Top 10 hit.
Taylor Swift rises 23 places to 24 with 'I Knew You Were Trouble', while DJ Fresh leaps 13 spots to 25 with 'Gold Dust', one place lower than its original peak position in 2010.
The Pogues and Kirsty MacColl climb up to 27 with 'The Fairytale of New York', the eighth year in a row that the track has reached the Top 40 around Christmas time.
Mariah Carey also rises to 30 with festive favourite 'All I Want for Christmas is You'.
Imagine Dragons score two Top 40 hits, with new tracks 'Radioactive' and 'Hear Me' landing at 35 and 37 respectively.
The Script enter at 38 with their latest track 'Six Degrees of Separation'.
Ladywell Primary School land at 39 with their version of 'O Holy Night', released to raise money for the Meningitis Research Fund in memory of pupil Caden Beggan.
Athlete also sneak in at 40 with their 2005 track 'Wires', after Rylan Clark performed it on The X Factor last week.
Watch the video for 'Troublemaker' by Olly Murs below:
Source: Official Charts Company
> This week's albums chart