The Saturdays singer, who has blogged for HELLO! Online since April, was bombarded by questions from her fans.
The Irish beauty revealed her biggest achievement in life so far, the band's plans for next year and snippets about family life.
The mum-of-one, who got her first UK number one with What About Us earlier this year, said "Creating my beautiful daughter Aoife Belle" was the biggest achievement of her life so far.
She talked more about family life with her rugby player husband Ben Foden and their adorable 20-month-old daughter Aoife.
"Myself, Ben and Aoife spent our first family summer holiday in Portugal so it is very special to us," she said, much to the delight of her Portuguese fans.
Speaking of her husband of 18 months, she said that although she loves her native Ireland, her heart was "stolen by an English man."
When asked if she and Ben would be having more children she replied, "We would love to have some more but not for while."
The 32-year-old said her Christmas will be "a peaceful one with friends and family" – and she may well be relaxing in front of her favourite festive film Santa Claus The Movie which brings back "great childhood memories" for her.
The songstress also promised fans that 2014 will be a "very exciting year" for the band, adding that they are all "so excited that Frankie is back with us really soon".
Una updates her blog regularly as she juggles her pop career with the Saturdays and her role as wife and mum to Ben and Aoife. Check out her exclusive HELLO! Online blog here.