The One Direction hunk - who got engaged to the blonde beauty in August last year - was thrilled that his ''baby'' had climbed to number one spot on the digital sales chart alongside Jesy Nelson, Jade Thirwall and Leigh-Anne Pinnock.
The star wrote on Twitter: ''So proud of my baby !! Download the tune and keep it @ #1 !! :) xx (sic)''
Zayn's 1D bandmate Niall Horan also applauded the girl group for the success of their second studio album which was released in the US on February 4.
He wrote: ''The lovely girls of LittleMixOffic have are at #1 on the iTunes chart, you guys gotta keep it there for the week! It's a great album ! Xx (sic)''
Both One Direction - which also includes Harry Styles, Liam Payne and Louis Tomlinson - and Little Mix were catapulted to the spotlight on singing contest 'X Factor' and show boss Simon Cowell was also keen to offer his congratulations.
The media mogul added: ''I have just been told that the new little mix album is number one on the us iTunes album chart. That is bloody fantastic. Congratulations. (sic)''
'Wilson', starring both Dern and Harrelson, is released in U.S. cinemas on March 24th.
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