Sean Cullen
Twitter Star
Childhood best friend of One Direction's Niall Horan who has accompanied Niall on tour. He has over 170,000 followers on Twitter.
He flew out to New York to join Niall atop the Empire State Building in 2012.
Niall took him and a group of other friends to Spain after a tour in 2013.
He is from Mullingar, Ireland and grew up with a sister named Kate. He has been in a relationship with Irish dancer Melissa Maloney.
His best friend Niall was joined in One Direction by Liam Payne.