Byrne, who won Dancing with the Stars in 2018 with singer Jake Carter and in 2024 with Paralympian Jason Smyth, will join longstanding judges Loraine Barry, Brian Redmond and Arthur Gourounlian.
Byrne said: "I am absolutely delighted to join the judges' panel for my eighth season of Dancing with the Stars. Having been lucky enough to win it twice and working with all my incredible dance partners, it will feel strange sitting on the other side of the desk.
"I can't believe it - I have to pinch myself! It doesn't feel real - I don't think it will feel real until I sit in the chair. I've always looked at the judges' seats and thought that must be the best seat in the house."
The professional dancer added: "The DWTS journey is the best, this show is in my veins - I absolutely love it. I feel so honoured to now be on the judges' panel with the fabulous Loraine Barry, Brian Redmond and Arthur Gourounlian. Let the madness commence... please can it be January already?"
Head judge Loraine Barry said: "I'm thrilled to be heading into season eight of DWTS Ireland, especially as we welcome the two-time champion Miss Karen Byrne to the judging panel. Karen is fresh off the dance floor into the judging seat and I look forward to working with her."
Arthur Gourounlian commented: "I am over the moon to be returning for my fourth season of Dancing with the Stars! And what can I say about the incredible Karen? After watching her grace the dance floor with pure magic for three seasons, I'm beyond thrilled to now share the judging panel with her. It's going to be absolutely electrifying!"
Brian Redmond added: "I'm chuffed that Karen will be joining us on the judging panel this year after winning two glitterballs and seven seasons on the show, I think she's earned her place. I'm sure she'll challenge me, and maybe I'll challenge her, but it all makes for great excitement ahead of the new year."
Byrne is a celebrated Ballroom and Latin dancer from Ballyfermot and has featured as a professional dancer for seven seasons of Dancing with the Stars.
She has also represented Ireland at international dance competitions, teaches at her own studio in Inchicore and has a weekly podcast The Carter Couch with her partner Jake Carter and his brother Nathan.
Jennifer Zamparelli and Doireann Garrihy will be returning to host Dancing with the Stars in January.
The first celebrity taking to the dance floor for the brand-new season of Dancing with the Stars will be announced on Monday December 9.
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