The dad of One Direction star Niall Horan has admitted that he fears the bands inevitable comedown.
The group may be sitting on top of the US charts and enjoying sell out tours around the world, but Niall's dad knows it won't last forever.
And at still only 18, he admits being nervous for Niall in the future.
Bobby Horan told the Daily Mirror this week: "The only thing I'm worried about is hopefully it'll be a long period being at the top.
"The comedown from that I'm a little bit worried about. It's always at the back of my mind. You're up there on a high but it's a big drop after that.
"But he seems to be coping with everything brilliantly - a lot better than I would."
The group sold over 170,000 copies of their debut record Up All Night to keep fellow Brit Adele off the US album top spot last week, managing to go straight to number one with their debut album, a record setting feat.
But Niall's dad Bobby insisted that his son was still keeping his feet on the ground despite all the success.
He added: "They've been [in America]for the past couple of weeks doing promotional work and they have worked their butt off.
"He's very grounded but he's buzzing. He's on a real high now."