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21 December 2011, 15:36 | Updated: 21 December 2011, 15:49
The 'What Makes You Beautiful' singer is the subject of a fan campaign to get him as many followers as the rest of the boy band.
One Direction fans have launched a campaign to get Niall Horan up to 900,000 followers on Twitter.
The 'Gotta Be You' singer is the only member of the band not to have passed the milestone, and 'Directioners' have managed to get "#followNiallOfficial' trending across London this afternoon (21st December).
"Niall is the only member of 1D that doesn't have at least 900k followers, so on 22nd December at 2.00pm Directioners will trend 'everyone follow @NiallOfficial'," Twitter user @MollieWillson posted earlier today.
Fellow One Direction star Harry Styles became the first member of the band to reach over one million Twitter followers in November.
One Direction will begin their UK tour tonight at Wolverhampton Civil Hall to promote their first studio album 'Up All Night'.