Moyles revealed that he would leave the Radio 1 Breakfast Show and it was confirmed soon after that he would be replaced by Grimshaw.
"So are you proud of yourself?" quipped Moyles on today's show. "Do you not care about us?
"Strolling in here... let me tell you something young man! Signal Radio, I had to live in Stoke-on-Trent for my craft. Chiltern Radio... Milton Keynes! I lived in Milton Keynes for this dream job.
"You stroll in here, you've never worked at another radio station before and you think that you can take my dreams away from me!"
On whether he ever imagined getting the job, Grimshaw said: "I never did, not in a million years. It's so exciting. It only feels real today, because yesterday was very surreal."
Digital Spy music editor Robert Copsey and Sugarscape editor Kate Lucey react to the news: