Former X Factor finalist and Celebrity Big Brother winner Rylan Clark has revealed that he doesn't understand Justin Bieber's recent 2-hour concert delay because he should understand that being constantly busy is part of the job.

Speaking to Digital Spy, he confessed that there's no excuse for keeping fans waiting - especially for that long - and that the 'Boyfriend' superstar should have just soldiered on and got on with it:

"I wouldn't ever do that. I can't believe it. I think it's disgusting. Absolutely terrible. I'm not being funny, but I came straight out of the Big Brother house, had 45 minutes' sleep and I was bang on time for my tour the same day - so he could have done the f**king same."

Other music stars have given differing opinions to Clark's as earlier today (March 7), hitmaker Wiley admitted that having to face a problem like Bieber did just shows people that he's only human. Nicole Scherzinger, meanwhile, explained that she didn't understand why there was such a delay because her team runs like a 'military' operation and would never be late.

Listen to the crowd's reaction at Bieber's lateness here: