Simon Cowell got a stern telling off from Declan Donnelly during Friday night’s Britain’s Got Talent semi-final show after making cat noises down the microphone.

The judge, 63, began making odd sounds while fellow panellists Amanda Holden, 52, and Alesha Dixon, 44, gave their feedback following Romeo and Icy’s performance to One Direction’s Best Song Ever.

While Simon had praised the duo’s routine despite telling them that he doesn’t think they are the ‘best we’ve ever had’, Alesha and Amanda were harsher and said they were underwhelmed.

Clearly, not in agreement with them, Simon started purring.

While Alesha and Amanda paid the dad-of-one no mind, Dec was clearly irked and eventually called him out.

Simon Cowell made distracting noises while his co-stars Alesha Dixon and Amanda Holden attempted to share their feedback (Picture: ITV)

Dec ordered Simon to be quiet after he kept making strange noises down the mic (Picture: ITV)

‘Simon, Simon,’ he said. ‘Can we hear what they’ve got to say to the guys please.’

Simon replied: ‘Oh, sorry!’

Viewers were also less than impressed by Simon’s behaviour with many branding the mogul ‘rude’ and ‘disrespectful’.

Taking to Twitter, one person wrote: ‘Simon being disrespectful making stupid noises while judges are talking, grow up man.’

Echoing a similar sentiment, another said: ‘Simon [is] being extremely childish and rude! Trying to drown out the other comments. Pathetic.’

A third added: ‘What’s up with Simon making those stupid noises, very childish and not very professional 🙄’

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This year’s series of Britain’s Got Talent will come to an end after Sunday’s grand finale, which will see the remaining acts take to the stage one last time.

Before the end of the show, one winner will leave the competition with a life-changing £250,000.

Britain’s Got Talent Final airs on Sunday at 7.30pm on ITV.

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Viewers weren’t impressed.