Britain's Got Talent host Dec Donnelly wasted no time in calling out judge Simon Cowell, causing him to apologise.
Simon was making bizarre noises at two of his co-stars during Friday's episode, after they critiqued an act he liked.
After dancing duo Romeo & Icy's upbeat performance, both Amanda Holden and Alesha Dixon admitted they did not think it was good enough for them to win.
Simon was thrilled by the routine, so to hear the judges not agree with him led to him making cat noises at them, as if to suggest they were being spiteful with their remarks.
Both Alesha and Amanda ignored Simon as he continued to make the noise for minutes, meowing into his microphone.
While it got some laughs from the audience, it also created awkwardness as the panel tried to say what they wanted to say to the duo.
In the end Dec jumped in and called him out, telling him to stop - leading to an awkward apology.
As Simon carried on for minutes, Dec interjected asking for Simon to let the act hear what the judges had to say, making it clear he needed to stop.
Simon suddenly stopped and looked red-faced as he said sorry and went quiet, while Amanda and Alesha did not look at him.
Viewers at home praised Dec for the move, as they too grew frustrated over the constant meowing.
One viewer said: "Yes dec he wants to hear what the guys have to say with Simon making those noises it’s a bit rude to be honest to do that."
Another agreed: "well done ant and dec for shutting simple simon up!"
A third fan said: "Love that Ant and Dec just told Simon off," as a fourth tweeted: " Simon getting told off by Dec."
It comes following the announcement of the eight finalists so far across this week. The latest two announced were Malakai Bayoh and Duo Odyssey on Thursday.
Young singer Malakai was sent straight through following his incredible performance, with him topping the initial public vote.
It was then down to aerial hoop duo Duo Odyssey and musician MB14, and the judges were tasked with picking one act.
The judges ended up being split on their decision, and Bruno took it to the public vote once again - with Ant and Dec confirming Duo Odyssey were in the final.
On Wednesday Ghetto Kids and Travis George were sent into the final thanks to the pubic votes, with the judges divided.
Dance group Ghetto Kids were sent straight through to the final by the initial public vote, already having impressed the judges with their performance.
This meant singer Travis had to go against guitarist Harry Churchill, with both of them in the top three.
It was up to the judges to choose who to save but after Bruno and Alesha saved Travis, Amanda and Simon opted to save Harry.
Ant and Dec had to go back to the public vote, where it was revealed Travis had been saved with Harry going home.
On Tuesday night, Viggo Venn and Olivia Lynes were the two acts revealed to have made it through.
First to be confirmed for the final was comedy and dance act Viggo, who shared his love for Hi Vis jackets - before getting everyone on their feet.
Despite not impressing everyone during the first audition, the act won the judges over this time as Alesha and Simon both confessed they loved his act.
The judges even claimed it was the best act of the night, and were thrilled when he made it through to the final based on the public vote.
Olivia then had to face fellow top three act Johns’ Boys, a choir group, as the judges were asked to choose which act to send through.
While Bruno saved Johns’ Boys, Simon, Amanda and Alesha all picked young singer Olivia which left her in tears.
Meanwhile, on Monday it was dancer Musa Motha and singer Amy Lou who won the first Britain's Got Talent semi-final of the series.
Talented dancer Musa, 27, was sent straight through to the final by viewers, so it went down to the judges' vote.
Ukelele musician and school teacher Abi Carter-Simpson and sunbed receptionist-turned-singer Amy Lou went up against one another.
As the judges struggled to decide, it went to the public vote and Amy Lou came second in the public vote. There will be 10 acts in total in the live final on Sunday.
Britain's Got Talent's live semi-finals air all this week at 8PM on ITV1 and ITVX.
