They appeared on the cover of The Sunday Times Magazine in April, in a joint interview about their on-screen partnership and off-screen friendship.
But, despite the humorous photo shoot that accompanied the article on April 7, Phillip Schofield is said to have been left seething since the piece went to print, after graphic designers chose to superimpose a crown onto Holly Willougby's head in the picture, splashing the words 'Queen Holly' underneath the image of the two of them.
The article's sub-heading evidently rubbed salt into this wound, as it read: 'How Holly Willoughby eclipsed Phillip Schofield and became Britain's hottest TV star.'
Usurped? Phillip Schofield is said to have been left seething after a crown was superimposed onto Holly Willougby's head on the front cover of their joint Sunday Times Magazine interview in April
According to The Sun, Phillip, 57, has been stewing over this for the past two months, even letting it get in the way of the The Morning Live event the pair co-hosted in mid-May.
'To say there has been a bit of tension is an understatement,' a source told the publication. 'When the magazine dropped, Phillip was fuming that Holly had a crayon crown airbrushed on to her head while he was crown-less and pictured grumpily looking on in her shadow.
'Phillip was pretty peeved, to say the least — not with Holly but with how he had been usurped. For her part, Holly was also quite mortified and felt terrible. ITV, who set up the interview, kicked off and his team promptly received a letter of apology to smooth things over.
'Tensions spilled out into the Birmingham live event when Phillip was grumbling about it. It quickly became the talk of the set. Phillip basically stuck his neck on the line for Holly and got her the job on This Morning back in the day. Understandably, the whole thing was a bit galling.'
MailOnline has approached reps for the pair for comment.
Chin chin! If tensions have been high, as this source suggests, viewers of the pair's daytime magazine show would never know it, however
Down the hatch! Just last week they were up to their usual tricks on This Morning, seen testing an array of flavoured spirits and getting merrier as the show went on
If tensions have been high, as this source