The singer’s son Jake welcomed his first son with his partner on Friday.
Sinéad was quick off the mark on social media to inform her fans that she was now a grandmother.
In a Facebook post the singer welcomed her first grandson.
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“Don't mess with Abuelita.”she wrote alongside a cartoon which spelled out ‘It’s a Boy’.
She had been keeping her fans updated on progress of the birth having posted on Thursday that her son’s partner had gone into labour on Thursday.
The singer posted this message to her fans on Thursday.
“OMG! Am literally hours away from the greatest dream of my life coming true!
ӻ#Granny!
“This for Lia and Jake and their little angel, who flew about with me in Vegas last week as I was singing the Foggy Dew.”
