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Rex Features
The couple, who already have daughter Nicole, three, and nine-month-old son Patrick, confirmed that a new addition to the family is due early next year.
"I know a lot of you have already heard the rumours, but I wanted to confirm to you myself that Gillian and I are expecting another baby," Filan wrote on the group's website.
"We've been keeping it a complete secret from everyone for a while, and made the announcement at my 30th birthday party on Saturday.
"The baby's due early next year and we're completely over the moon about it. The thought of becoming a dad for the third time is just amazing!"
Earlier this month, Westlife confirmed that they had started work on their tenth album.
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