Showbiz
Rex Features
The 40-year-old former Catatonia singer, who already has daughter Glenys and son Johnny with her ex-husband, is apparently "doing very well" despite going into labour eight weeks early.
The Daily Star printed a statement from Abbott, reading: "How happy I am to let you know that our baby boy was born on Monday 23, eight weeks earlier than expected."
He continued: "We are doing very well and excited now (sic) to share this happy news with you. What an amazing surprise. Love always, Cerys and Steve."
Matthews and Abbott have not yet revealed what they will name their baby.
More: Cerys Matthews, Showbiz
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