Taking to Instagram, the 40-year-old posted photos of herself in a purple two-piece bikini as she posed on her balcony, showing off her toned abs.
Another candid photo shows the beauty walking through the clear waters off the Mexican coast.
“I arrived in Mexico,” she captioned the snaps. “First time here, I’m so excited.”
The mother-of-two is staying at the exclusive Secrets The Vine, a 5-star adults-only hotel on Kukulkan Boulevard.
She shared a video showing her spacious apartment, which overlooks the Caribbean Sea, with sofas, a dining area, a bathtub, a flat screen and a double bed.
Una is in the luxury of the resort which features a spa, gym, hair salon as well as gourmet cuisine including Asian, Italian, Mexican, Peruvian and Mediterranean options.
Prices for a stay in the glamorous hotels start at over €600 per night.
With no sign of her children, Una’s vacation companion has so far remained behind the camera.
In the blink of an eye, a male reflection appears showing a mysterious man working out on a spin bike as the singer took a mirror selfie in workout gear.
The Tipperary beauty is said to be dating a dashing Dublin man who works as a Garda in the city centre.
According to insiders, the pair are having fun together as Una has had a turbulent few years romantically.
Una’s well-deserved break comes just weeks after ex-husband Ben Foden admitted responsibility for their split in 2018.
Ben admitted he made things very stressful for the singer after he cheated on her and ended their six-year marriage.
“To be honest, the way things happened and the things I put Una through were quite stressful at the time, so I’d be a brave man to say I knew it would turn out like this.” , did he declare.
But he insisted the former flames now have a good relationship where they are able to successfully co-parent their two children, Aoife Belle (9) and Tadhg (6).
“I’m happy things are getting back on track and Una is happy.”
“She is happy at work, she is happy in Ireland with her family. She is also happy in her life, which is great,” he added.
“I have always said about Una that she is a great mother, a great mother to the children. They are always in a loving environment. They really excel in terms of academics and sports and go to school and are just social with everyone.
“Everyone says they’re great kids no matter what environment you bring them into. That’s the main thing, whether they’re healthy and happy, whether they’re with Una or me. , we try to create this environment.