Viewers got a bit of an eyeful when Adam Pacitti flashed as he chatted to Dan Wootton and Laurence Fox.
He had joined the pair on video to ask what appeared to be an innocent question about people being offended by jokes. As he chatted he moved slightly, and a mirror behind him was revealed – showing a reflection of his bare bottom.
Watch: Simon McCoy laughs during live news broadcast about a polar bear
Wootton and Fox seemed to be completely unaware as Pacitti told them: “I am a man that loves to laugh. I am of the belief that either one can joke about everything or nothing at all because somebody will always be offended by a joke. What are your thoughts on that?"
However, viewers tuning in were quick to spot that the cheeky comedian had flashed his behind.
Most thought the stunt was hilarious, with one person on Twitter calling Pacitti their “hero”. “Amazing,” declared another viewer, while one said the scene was “incredible”.
Others quipped that GB News was the “butt of the joke”.
It was not the the first time that the channel has been pranked since starting this month, and McCoy has now urged viewers to pack it in and "grow up".
He and other presenters such as Alex Phillips were recently tricked into appearing to say some rude words on air when they read out comments from listeners claiming to be called “Mike Hunt” and “Mike Oxlong”.
Addressing it on air, he said: “I’m just going to say something because if you’ve seen the papers, if you’ve seen Twitter, some people think it’s really funny to send in texts and messages on the basis that if we read them out we’ve been had.
"And you’re still doing it, and I’m watching them, and it doesn’t help anybody."
"We’re just not going to read surnames from now on,” Phillips chimed in.
"So, to the person who has just messaged in… grow up!” McCoy went on.
Read more: Everything you need to know about GB News
"We’re a new company, we’re a new broadcaster, there are systems that we are putting in place that would stop idiots like you getting through. They’re getting through at the minute but please, we’ve got other things to worry about."
Watch: GB News reads outs message from 'Mike Oxlong'