The Irish beauty is usually known for her glossy auburn mane, but it seems it's out with the old and in with the new for Una.
Clearly fancying a change, the mum-of-two has now revamped her tresses and last night, Una took to Instagram to debut her new look.
And it's totally gorgeous, right?!
Sharing a snap of her new 'do, Una showcased her newly-dyed chocolate brown tresses for fans to see.
Alongside her photo, she asked her followers what they made of her image overhaul. She said: "I've said goodbye to the red for a while... #yay or #nay"
On seeing her post, it seems Una's fans were torn between her usual hue and her darker locks - but all agreed the starlet can pull either off just as well!
One user said: "Nay red hair on you looked amazing! But whatever you choose, you'll pull off :) x". While another said: "#yay suits you more this colour, looks lovely!".
As well as opting for a new all over colour, Una - who recently gave birth to her newborn son Tadhg - revealed she had added extra length to her locks too, with a fresh set of fab extensions courtesy of Great Lengths Ireland.
She isn't the only famous redhead to head over to the dark side recently, as Big Reunion star Natasha Hamilton swapped her strawberry strands for a uniform chestnut brown hue earlier this year.
And we have to say, her sophisticated new 'do has got us reaching for the hair dye!
We're loving their new looks, are you?
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