Update: Una has confirmed this news via Twitter 
Yes the news is true! @ben_foden and I are expecting a baby BenUna! We are both very excited xx
Everyone here at The Saturdays Fansite sends their congratulations to @unahealy and Ben Foden on the announcement that Una and Ben are expecting their first child, the news was broken by the Daily Mirror last night and has been picked up by the media throughout the night.
The βdelightedβ 29-year-old rushed home on Wednesday night to break the happy news to her mammy and daddy in County Tipperary (itβs a long way, but she had to do it).
The Irish beauty says: βIβm really happy! It was totally unexpected, but me and Ben are really excited.β
Ben is currently on the other side of the world, touring New Zealand with the England rugby team for the World Cup.
He celebrated the announcement with team-mates including Mike Tindall and Jonny Wilkinson at their hotel in Queenstown.
As for Unaβs bandmates, they are made up.
The girls said last night: βWeβre so excited for Una! We canβt wait to have a sixth Saturday.
βBen and Una are going to be fab parents!β
The singer will reach the three-month mark next week, and has undergone regular hospital check-ups to ensure the baby is healthy β although she doesnβt yet know the sex.
Una has shelved plans to celebrate her 30th birthday with Ben in New Zealand next month, as sheβs worried about the effect the long-haul flight might have on her and the little βun.
The couple have been dating since November 2008 and Ben, 26, revealed in March that he planned to pop the question over the coming months.
He said: βWeβve been discussing marriage for some time. It will happen and I want lots of children.β A friend said: βAll the girls are absolutely overjoyed for Una β they canβt wait to meet the first Saturday baby!
βHe or she is going to have four very excited aunties when they arrive in late March.
βAll of Unaβs family are really supportive, too. She was overwhelmed by the response when she went home.
βBenβs delighted. Heβs looking forward to celebrating fully with Una when the World Cup is over.β
Una returns to the UK to perform with the band on Friday.
A pal says she will continue with their schedule as planned, βright up until sheβs fit to burstβ.
The Saturdays will be promoting their forthcoming album and completing their All Fired Up tour, which kicks off in December.
Although Unaβs skimpy outfits might have to be let out a littleβ¦.
Vanessa on Twitter:
Soo excited about @unahealy having a lil buba what an amazing mum she will be! Canβt wait xx
Congratulations to Una, it most certainly is unexpected. Most times we have the media heightening speculation but this is complete shocker and great news. Glad to see Una confirmed tour is going on as normal!