One Direction will never go off the rails because they are so well behaved, says Simon Cowell.
The British boyband found fame on Simon's UK TV show The X Factor and signed with his label SyCo after it finished.
He is extremely proud of how far they have come and has no worries that they might experience problems like some other young stars.
"No, we have the very best team imaginable for the boys," he told Heat magazine. "They are the most grounded artists I've ever worked with. They're really nice boys, so there are no tantrums. It's my job to make sure they are happy."
One Direction - comprising of Harry Styles, Zayn Malik, Louis Tomlinson, Liam Payne and Niall Horan - showed just how far they have come at the BRIT Awards last week, when they received the Global Success prize.
All eyes during the event were on member Harry Styles, who was teased for his legendary lothario status by Sharon Osbourne when she was presenting a trophy.
Harry's ex-girlfriend Taylor Swift was also at the ceremony, with the pair apparently experiencing an awkward moment backstage. As Harry stood talking in a corridor Taylor appeared and walked past him with her team.
Seemingly adding fuel to the claims that their romance didn't end well in January, neither Harry nor Taylor spoke to each other.
Taylor gave a storming performance of her track We Are Never Ever Getting Back Together at the event, with Harry happy to speak about how fantastic she was on stage.
"I thought her performance was great," he said. "She looked really good."
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