The 37-year-old actress uploaded the picture of her and two-year-old Polly to Instagram, writing: "Me and Poll at the bonfire [sic]."
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Coronation Street star Kym divorced Polly's dad, actor Jamie Lomas, earlier this year and has since moved on with personal trainer Dan Hooper.
Kym also has teenagers Emily and David from a previous relationship, and she and Dan have discussed adding to the family.
Sadly for the former Hear'Say singer, she cannot have more children after health problems led to an ablation of the womb.
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She told a British magazine: "When they did the operation they asked me if I wanted anymore children and I said no because I was in a different place then.
"Also, having kids for me is really traumatic; I didn't want what I went through with Archie."
Kym and Jamie's son tragically died minutes after being born prematurely in 2009.
She continued: "But now I've met Dan we're a bit upset as we would have loved to have kids together in the future.
"Our friends have already told us they'd have our baby for us! Later down the line, when we've had a couple of years together, we'll think about that."