The boyband was originally composed of Niall Horan, Liam Payne, Harry Styles, Louis Tomlinson, and Zayn Malik.
The 57-year-old producer said he is closest to Tomlinson and was ecstatic when he finally released his solo record recently, reported Billboard.
"Actually, with all the boys, if I'm being honest with you. They've worked for this. But yeah, you do feel a little bit like a proud dad when you see all five of them doing well now...
The former "American Idol" judge said he gave a detailed advice to Tomlinson, since he was the last to officially launch his solo career.
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