Una was performing at the Dublin leg of The Saturdays’ Greatest Hits tour when it looked like her costume had been altered to accommodate a baby bump.
The singer and rugby player husband Ben Foden revealed their pregnancy last week through a cute Instagram snap of her daughter Aoife Bell with the caption: “I know lots of people have been guessing and Ben and I can now confirm that Aoife is going to have a baby brother or sister next year!!! We're all very happy.”
In the photo, two-year-old Aoife is wearing a t-shirt reading: “I’m going to be a big sister!”
THE SATURDAYS: 'WE'RE JUST LIKE OTHER WORKING MUMS'
The 32-year-old’s pregnancy doesn’t appear to be affecting her energy levels just yet as she tweeted her excitement over her tour date in Dublin.
The mum-of-one wrote: “We are travelling to Dublin this morning for our show tonight! So excited #GreatestHitsLiveDublin.”
Una is the first of the Saturdays to have her second child, with bandmates Frankie Bridge and Rochelle Humes each giving birth to their first children within six months of each other.
Frankie, 25, gave birth to son Parker last October and Rochelle, 25, gave birth to daughter Alaia-Mai in May 2013.
The Saturdays’ tour bus will be more like a crèche at this rate!