"I've never really in my life had a great representation of what a good marriage is," the singer, 25, tells PEOPLE. "My parents divorced, and a lot of people in my family are divorced, so I hope to give my son a great model of what a happy marriage is or relationship could be."
Bowersox announced her plans to tie the knot with musician Brian Walker last week, and it's the first marriage for the Ohio native, who memorably split with her then-boyfriend before the Idol finale.
And she's not the only Walker fan. Bowersox says her son, Tony, 1½, who is from a previous relationship, loves spending time with her fiancé.
"Brian's known me for a long time, and so he's been a part of my life for a long time," she said Tuesday at the Hard Rock's Pinktober Breast Cancer Awareness Program Launch. "He's known my boy. They laugh constantly. It's hilarious."
As for her wedding plans, Bowersox is no Bridezilla, and she's not focusing on any detail in particular.
"None of it has to be perfect – just the part of saying, 'I do.' That's the only thing that really matters, right?" she says. "If everything else goes wrong, it doesn't matter. We're married. We've got the rest of our lives to have fun."