He will have his hands full with an eight-week-old daughter and a set of boisterous twins this Christmas.
But Byrne said there is going to be one very big hole in his festive plans.
He told the Herald: "I lost my grandmother recently and she was always a very big part of Christmas so she will be sorely missed. She missed the birth of Gia by two weeks and she was my mam's mam so she was the real rock. Christmas will be a bit different this year because she used to always come over to the house with everybody, but we've got a new arrival to be very excited about so Santa will have a nice present for her."
The former Westlife star (35) has fond memories of his gran.
He said: "She was 84, she had a great life and was very proud of me. When I went in to see her in intensive care, all the nurses in Beaumont said, 'Jesus all we've heard about is you over the last two days."
But Nicky is looking forward to his first Christmas as dad to a little girl after he and wife Georgina welcomed Gia into the world at the end of October.
It will be a bustling household in Malahide with twin brothers Rocco and Jay (6) also looking forward to Santa.
"She's absolutely beautiful," Nicky said of his precious daughter.
"Unlike the lads she is real placid and calm, a real little girl. I have good conversations with her.
"I've told her she's not allowed in nightclubs and not allowed to have boyfriends."
Nicky revealed it will be full steam ahead in terms of work projects for next year.
He's considering his options in the UK and Ireland and is hoping his stint presenting RTE music show The Hit last summer could open more doors for him across the water.