Westlife star Mark Feehily has revealed that he is to welcome a baby with his fiancé Cailean O'Neill.

Feehily, who is due to play Croke Park with the boy band on July 5 and 6, and his boyfriend of six years announced the news today - the same day as the singer’s 39th birthday.

"It really makes this my most special birthday EVER to let everyone know that later this year we will become Dads for the first time," they said in a caption of an Instagram post of a baby scan and babygrow.

"This is the proudest moment of our lives and we are beyond excited to say it out loud!"

Westlife are currently in Glasgow on the fifth night of their sold-out reunion tour and the singer's fellow bandmates - Shane Filan, Nicky Byrne and Kian Egan - offered their congratulations to Mark.

"Such huge excitement here today. Not only is it Mark’s birthday, but then for him and Cailean to share the news that they are having a baby," said Kian Egan.

"You gotta love this Westlife family. 10 Westlife babies now."

Westlife play Croke Park on July 5 and 6

"So happy for you guys! You two are gonna be the BEST parents," said Shane Filan’s wife, Gillian.

Mark and Cailean got engaged in the Maldives last February. The Westlife singer recently revealed his plans to start a family before he turned 40.

Speaking to The Mail on Sunday a few weeks ago, he said, "I can't wait to be 40, hopefully I will be turning 40 the happiest man in the world with a family,"