The ITV show was in full flow on Thursday morning when news emerged that Johnson was likely to step down.
The government had been a hot topic from the get go and presenter Lorraine Kelly giggled when one segment of her programme saw a 'psychic' pig predicting that the PM would go.
But things had settled down and she had just started to interview JLS star Aston Merrygold when she heard her show was going off air.
Apologising, Kelly quickly said goodbye to the singer and the programme was replaced by the news.
Some viewers were miffed about the talk show cutting to the Johnson coverage, and others thought it was a bit unfair for Merrygold.
"Poor Lorraine been cut off," one person posted on Twitter.
"Boris ruins everything, even the interview with @AstonMerrygold ugh," said another.
"That is so unfair on @AstonMerrygold, stopping his interview for Boris," someone else posted.
Kelly did weigh in on Twitter herself when a fan called Amy tweeted: "Shocking that half your show was cancelled Lorraine."
"Not my decision Amy," said the TV star.
"Back tomorrow as usual at 9am - hope to see you then."
She added two heart emojis to her message.
Watch: Lorraine Kelly pays tribute to Dame Deborah James