The popstars posted a snap online of their respective children Aoife Belle, 10 months, and 1-year-old Faith holding hands while smiling up at the camera.
"Undoubtably two of the most cutest little girls ever! #babyfaith & Aoife Belle!," Heaton wrote on Twitter. "Thank u @UnaTheSats for having us.. "
Healy had Aoife Belle with rugby player husband Ben Foden, while Faith's father is Heaton's spouse of two years Hugh Hanley.
Healy previously admitted that she suffered post-natal depression triggered by her inability to breastfeed Aoife Belle as a baby.
[Left: Una Healy with Ben Foden and Aoife Belle / Right: Michelle Heaton with Hugh Hanley and Faith]
"I really missed being pregnant and having her to myself," she said. "When she's out there, she's out there for everyone to look at. She's not just yours anymore."
Heaton, meanwhile, has credited Faith with helping her recover from a double mastectomy, which she underwent last year after being told that she stood an 80% chance of developing cancer.
"As a mum, you never want to anticipate leaving your child without a mum," she said.
"The whole point of this was to get the dark cloud away from my head and to get on with life, and I'm on that path now so I just want to look towards the future."
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