Ed Sheeran's 'X' also returned to Number One on the album chart
Song will feature on Ronson's forthcoming album 'Uptown Special'
Track was streamed 2.34m times in a week but still failed to reach Christmas Number One
Mars put his hair in curlers for the occasion
Musician discusses having to rush-release his first Number One single
Forthcoming album inspired by New York hip-hop scene of '90s
DJ and producer describes it as "pretty much the coolest thing ever"
X Factor judge says there was no ploy to have song released early
Ronson was forced to bring the release of his single forward by five weeks after the reality show performance
Single release date was brought forward after being featured by 'X Factor' contestant Fleur East