Ed Sheeran will be in the RTE studio from 4pm to 5pm to co-host the popular live radio show.
""He's co-hosting the show for a full hour. He's going to be chatting and singing live and we're going to do regular pieces of the show and run some competitions that we'd usually run," says Eoghan McDermott.
"I want to just riff on what's going on in Ireland and the news and not make it formulaic. It's exactly the kind of experience you want to give to people. Hopefully it will be pretty great."
One lucky listener will get a chance to win a pair of tickets for Ed's upcoming Dublin gigs too.
"He's got pretty much the last pair of tickets in the whole of Ireland to give away. He's going to call a listener by the end of the show and give them away," McDermott told RTE's website.
"We're going to have limousines on standby in all four provinces of Ireland and pick someone up and get them to the gig."