The Saturdays star, who hit 40 on Sunday, showcased her ample cleavage and taut midriff in a tiny two-piece as she relaxed by the pool.
The star also revealed her enviable legs and radiant complexion in the snap.
Her tresses were slicked back from her face and she appeared to go make-up free for the snap.
The special day comes after Una revealed that she is finally 'in a good place' three years after her divorce from Ben.
Una married Ben in June 2012 after four years of dating, but their marriage ended in 2018 amid allegations the rugby ace cheated on her.
Although shooting to fame in a girlband, Una said that she's now focussed on being a mum and her solo career.
She told in August: 'I'm juggling being a working mum and a full-time mum. But I'm in a good place now.'
She said: 'It was a different chapter when I was with the girls. We were constantly on the road.' (Mon 11) Views: 141
· Read All Bikini News Daily
Link to story: https://bikininewsdaily.com/bnd/UnaHealylookedincredible-2491