Phillip Schofield is said to have spent time with his lover in a £1 million flat next door to the This Morning studios after filming.
The presenter, 61, would sneak the runner into the apartment where they would spend hours together, a source has claimed.
It comes after Phil admitted to having an affair with a younger colleague, which he insisted was "unwise" but not "illegal".
Now it has been claimed the star would spend time with the runner in The Helios, an exclusive block within the ITV studios at White City, West London.
It has been claimed they would enter and exit the flat through the White City House hotel, to not arouse suspicion.
“Phil and the runner were often seen leaving at around 3pm, two hours after filming on This Morning had ended.
“They would use the entrance through the hotel and stay for an hour or two. Phillip’s driver was always waiting for him outside," a source told The Sun.
“I asked one of the security guards why the driver was still here and he replied, ‘Well Phillip and that young runner are up in the apartment.’"
Meanwhile, YouTuber Jack Jones claimed he was asked by Phillip not to post a video where the social media star can be seen spraying a confetti cannon, with Phillip and a younger male are in the background.
In a video shared on Twitter, Jack has claimed: "After I did the video, he begged me not to put the video up because he said, 'It could ruin my career' and I said, 'How could it ruin your carer?' And he said he didn't want to get into it."
A spokesperson for Phillip declined to comment when contacted by the Mirror.
Announcing the affair in a statement, Phil said: "The first thing I want to say is: I am deeply sorry for having lied to them, and to many others about a relationship that I had with someone working on This Morning.
"I did have a consensual on-off relationship with a younger male colleague at This Morning."
"I am painfully conscious that I have lied to my employers at ITV, to my colleagues and friends, to my agents, to the media and therefore the public and most importantly of all to my family.
"I am so very, very sorry, as I am for having been unfaithful to my wife...," he said in a statement released to the Daily Mail.
He continued: “I have therefore decided to step down from the British Soap Awards, my last public commitment, and am resigning from ITV with immediate effect expressing my immense gratitude to them for all the amazing opportunities that they have given me.
“I will reflect on my very bad judgement in both participating in the relationship and then lying about it.”
Phillip claimed he covered up the fling for years in a bid to "protect" his former colleague as he insisted the relationship was "unwise" but not "illegal".
The Mirror has reached out to ITV for comment. Phillip's representatives declined to comment when approached by The Mirror.
