The 'Golden' singer, Irish boyband and 'Never Gonna Give You Up' hitmaker are the first acts announced for the forthcoming festive extravaganza held at London's Palladium on November 25.
Kylie, 50, is excited to join the line-up, and has asked fellow performers to go all out with their Christmas outfits for the show.
She said: ''I can't wait. What are we wearing?! I'm very excited to be joining everyone for this special show.
''So excited to see everybody, we want Christmas sweaters, we want Christmas hats, we want dress up!''
Whilst Magic Breakfast's Ronan Keating, 41, revealed he'll be bringing his bandmates - Keith Duffy, Shane Lynch and Mikey Graham - along, which means they will no doubt perform songs from their seventh and last LP 'Thank You & Goodnight', which is released on November 16.
Ronan added: ''The Magic of Christmas is exactly as the name describes - a truly magical event celebrating the most wonderful time of the year.
''I'm so happy to not only host the concert with Harriet again this year, but to be able to perform with the Boyzone lads too.''
'Nativity Rocks!' is the fourth instalment of the 'Nativity' family movie franchise released in cinemas nationwide on November 23.
More acts are set to be announced in the coming weeks.
Tickets go on sale from September 21 at 9am, with tickets priced from £51 including booking fees plus P&P.
Head to magic.co.uk for more information and to win tickets.
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