Stevie Mulrooney (8) from Kilkenny revealed he had practised only five times, and only once on the day, before the brilliant performance at the Aviva Stadium before Ireland took on Italy.
“I remember the big crowds that scared the life out of me,” he told RTÉ Radio One’s Morning Ireland.
“I loved it.
“When I got into the song, I didn’t feel a little bit nervous,” he said.
He agreed the crowd was brilliant as they were cheering him on at the game that saw Ireland’s triumph over Italy with the score of 36-0.
Stevie was invited to sing by Ireland flanker Josh van der Flier, and performed after Jennifer Dalton had sung the Italian anthem and Amhrán na bhFiann.
He also spoke of his meeting with the Irish rugby team.
“I did meet them one day before the match,” Stevie said.
“It was great. There’s lots of special boxes but you weren’t allowed to take pictures. It was crazy for me because I brought my phone.”
He said it was great to once again meet his favourite players – Peter O’Mahony and Bundee Aki – whom he met on the Late Late Toy Show last year when he also sang Ireland’s Call.
“It was brilliant, they played great, Italy are a good team, but fair play to Ireland,” Stevie said.
Late Late Show host Patrick Kielty also praised Stevie’s performance.
“Knocking it out of da park. Never in doubt Stevie! Go get ‘em our Kid,” he wrote on social media.
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Ireland coach Andy Farell has praised Stevie for his rendition of Ireland’s Call and said: “This kid’s got it all.”
Stevie’s father Seamus Mulrooney said there were so many people who helped Stevie out in the run-up to the big day.
“From River Nore Music Academy, where he started his singing lessons, to one of his mentors Sylvia Knox who prepared him for the day,” he said.
“We have to thank Captain John Carpenter as well from the band who made them feel so at ease.
“Thank you to Jennifer Dalton who sang both the national anthems because she really kept him calm on the day which was wonderful and we really appreciate it, she was fantastic herself.”
Mr Mulrooney said Stevie might have gotten his talent from his grandfather and mum, to whom Stevie sang ‘Happy Birthday’ in Polish on air.
When asked where Stevie got his talent, Mr Mulrooney said: “Not from me anyway, that’s for sure.
“Maybe his mom, I’ve heard her sing in the shower and she’s a lot better than I am.
“We have a little bit of music background from my dad, who’s into traditional music and he used to play many years ago.”
And Mr Mulrooney joked: “So I think maybe it’s skipped a generation.