The 34-year-old tied the knot with George Kay earlier this year but she said, because of her previous bad luck when it comes to marriage, she won't say it will last forever.
Kerry told the Daily Star: "I've had so much bad luck over the years but that's just the way it goes.
"We've not got this perfect relationship, this fairytale Cinderella ending. It doesn't exist.
"We will argue. My mood swings can be outrageous. But it's how you react as a couple. And being a team. And working at it.
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"I can't predict this marriage is going to last forever. If there are two people in a relationship and one wants to get out there's nothing I can do to stop that."
Kerry's revelation comes after she and George got matching tattoos, and he got the names of all of her children tattooed on him.
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As well as their daughter Dylan-Jorge Rose, Kerry has daughters Molly, 13, Lilly, 11 and seven-year-old Heidi and son Max, six, from her previous relationships.
Tweeting about George's new ink, Love how you have all our babies names tattooed on your arm! You really are the most amazing dad!! @mrgsjkay love you so much xxxxx"