They were once the biggest rivals in RTE but now Gay Byrne will reveal all to Pat Kenny on his new programme.
Gay is to become the first major RTE star to appear on the Pat Kenny Newstalk programme.
"I'll definitely be doing Pat's show and I won't give it a second thought," Gay Byrne told the Herald.
"It works both ways as I'll be on Newstalk promoting a book from an RTE programme."
The 78-year-old has revealed he will be interviewed on the rival programme to RTE's Sean O'Rourke's Today show in October to promote book The Meaning Of Life, spawned from his interview show of the same name.
The veteran broadcaster had toasted Kenny's departure from RTE when he enjoyed a knees-up with the former Prime Time host and other station stars including Joe Duffy and Dave Fanning in O'Donoghue's pub last month.
However, Gay said he had still yet to hear Kenny's new Newstalk radio show, now in its third week.
"I'm just always doing something at that time of the morning but I haven't heard Sean O'Rourke's new Today Show either. That said the last time I heard Pat, he never sounded sharper or better," he said.
Speaking at the time that news broke Kenny was joining Newstalk, Gay had described his colleague as a "major loss for RTE".
He added: "I think money was at the root of it. I think he's been a little upset with RTE for some time. I think he has been a little dissatisfied in RTE and this is a major coup for Newstalk."
The promotion of the new Gill & Macmillan book will also see Gay back on his former Late Late Show next month with Ryan Tubridy.
"That's one I'm looking forward too," he said. "I'm going to be doing Ray D'Arcy on Today FM as well.
"It's a great book and with 40-plus interviews with the likes of Bono, Maeve Binchy, Richard Branson, Mary Robinson and Michael Parkinson, I will have plenty to talk about."
The Meaning Of Life will be released in October.