On Saturday Una and Aoife headed to Windsor for some seasonal fun at Legoland.
"Thank you @legolandwindsor for such a fun day x," tweeted Una with a sweet selfie of the pair.
The delighted youngster, who is soon to welcome a baby brother, even met Santa in his grotto and took home a special present.
On Sunday Una and Aoife were out again, this time for the premiere of Get Santa.
Una is pregnant with her second child, a little boy
Mum-to-be Una concealed her growing bump in a chic white shirt, which she wore with black jeans and boots.
"Having mother/daughter morning," tweeted the Ireland-born star. "Heading to see the #GetSanta film premiere! Looking forward to hearing @thesaturdays #christmaswrapping."
Stars of the film including Jim Broadbent, Raff Spall, Warwick Davis, Stephen Graham and Jodie Wittaker also walked the red carpet at the Vue cinema near Leicester Square.