The singer and former member of The Saturdays took to social media to wish her 649,000 followers a happy Christmas as she sat beside her daughter Aoife Belle (9) and son Tadhg (6) - who she shares with rugby star ex-husband Ben Foden - in their festive outfits.
Una stunned in a maroon, leopard print number, while Tadhg looked handsome as ever in his navy and green checkered shirt, and Aoife wore a black zip-up paired with a red, houndstooth print skirt.
Captioning the post, she wrote: “Merry Christmas Everyone.”
Many of Una’s friends and fans flocked to the comments section to acknowledge the trio’s likeness, with the Thurles native’s The Saturdays bandmate Frankie Bridge remarking that Una, Aoife, and Tadhg looked like “triplets.”
Another follower said: “Gorgeous family photo, Hope you are having a wonderful day!”
While a third chimed in: “Beautiful family. Have a lovely day Una. Beautiful boy and girl. Beautiful eyes.”
Una’s adorable family snap comes after she admitted that she had the “time of her life” while she was a member of girl group The Saturdays from 2007 until 2014.
Speaking on Ireland AM earlier this month, the 40-year-old said that she still considers her former bandmates – Frankie Bridge, Rochelle Humes, Mollie King, and Vanessa White – to be her closest pals.
“We got on so well. We were very lucky because obviously we auditioned and we were put together,” she said.
“We would go into the tour bus and we would pour our hearts out to each other about all of our woes and we were there to support each other we would always know if one was in a mood we would leave them to themselves.
“We're really good friends and we talk to each other all the time. And we have got our little WhatsApp group chat and we keep in touch there.
“We don't see each other as much obviously because we literally like lived in each other's pockets for years but so supportive of each other,” she added.