Ronan Keating has become a grandad!

Congratulations are in order for Ronan Keating ...

The Irish singer has become a grandad for the first time!

Ronan's 23-year-old son Jack Keating took to social media to announce the birth of his first child, whose name hasn't been revealed.

The reality TV star shared a black-and-white photo of himself cradling his newborn daughter, alongside the caption: "Welcome to the world my little princess."

Ronan - who shares his three eldest children, including Jack, with his ex-wife Yvonne Connolly, 49 - wrote in the comments section: "Little cutie."

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Jack has not been public about a romantic relationship and it is not known who the mother of the baby is.

The former Boyzone singer also shares daughters Missy, 22, and Ali, 17, with Connolly.

Ronan has been with wife, Storm, since 2010 and the pair have children Cooper, five, and Coco, two, together.