The former Hear’say singer has two children – Ava and Hero – from her relationship with ex-husband Graham Quinn.
She welcomed her 20-month-old son Apollo with fiancé and PR boss Simon Motson in August 2019.
The star, 43, admitted that being step-mum has its challenges but she has found a way to deal with it by “the most mature you can possibly be.”
Speaking on the Made By Mammas podcast, she said: “It really takes you being the most mature you can possibly be, even when you don’t want to be,” writes The Mirror
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“I said to Sim when we were first all living in the house together, I said that I’m not going to tell your children off because I don’t feel like that’s my role.
“And within 10 minutes, that’d gone out of the window when one of them is hanging off the monkey bars and another is trying to put a ball through a window.”
Myleene said she likened their situation to being stuck on a boat. She continued: “In the end, I just changed all that around and I sat them down around the table and said look, the only way we’re going to do this is, I see it as we’re all in a boat, this is how I view it.
“And one of you rocks the boat, we’re all going to feel it. And if one of you goes overboard, I’m going to grab you and make sure you’re safe. That’s the only way we’re going to get through it, is if we’re all in this together.”
Simon and Myleene dated for five years before he popped the question towards the end of last year.
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