A year ago she was singing Neil Diamond songs in front of regulars in her local pub but this summer former X Factor contestant, Mary Byrne, will be Neil Diamond's support act at the Aviva.
In an interview with the Irish Independent, she said: "Am I excited about it? I still can't believe it's happening.
"It's just been this huge, huge secret for the past few weeks, I wanted to tell people but couldn't.
"I've loved Neil Diamond since I got my first record player and here I am playing with him in my hometown."
When Byrne (51) takes to the stage at 8pm on Saturday 25 June she will be performing in front of a crowd of 45,000 at the second concert to take place at the Aviva stadium.
She added: "The scale of this is something I don't think I will understand until I walk out on stage. Heaven help me what it's going to feel like."
The mother of one was speaking from Edinburgh, Scotland, where she is promoting her debut album, 'Mine & Yours', which is released today.
