The ‘Saturdays’ singer, 34, posted a black and white photo of four-year-old Aoife Belle dressed head-to-toe in her school uniform.
“First day at big school! 😢,” Healy wrote.
Healy, who is also mum to one-year-old Tadhg with her husband Ben Foden, wasn’t the only one feeling like her child was growing up fast.
“So very cute it only seems like yesterday you were pregnant with her,” someone commented on the photo.
“How time flies, best of luck to Aoife!”
Another wrote: “Oh my goodness! WHERE has the time gone Una?! I completely see why you’re so emotional!”
Healy recently spoke out about not wanting to have any more children.
“I’m done now. I really don’t want any more,” she said in an interview with The Herald.
“If I see a baby I’m like, ‘No definitely not’.
“It’s tough and really hard work. I’m just so happy with two.”