With the season 7 premiere of the MTV hit premiering Monday, the reality star opened up to PEOPLE about their family unit and upcoming nuptials, as well as the special role she's given her daughter Aubree, 6.
"Cole is such a great guy, all the time," Houska, 24, tells PEOPLE. "He's so calm, even when I'm worried about something."
"He's just so great to me and to Aubree, so to be able to know that I can have that person forever is the best feeling," she adds. "That's what I've always wanted – a family – and I feel finally like that's exactly what I have."
Houska and DeBoer have been dating since summer 2014, and he popped the question last November. Now, the two are "deep into planning" their fall wedding – but they're keeping it intimate and simple, "nothing too over the top."
"It's going great so far," Houska says. "We both want a small wedding."
And while the MTV star says she's taken the lead in planning, DeBoer has been involved too.
"He works a lot so I'm kind of the one that is going [to all the appointments,] but I don't make any decisions without running it by him first," she says. "We have the same taste and the same ideas, so far it's been really easy."
As for her daughter, Houska says she wanted her to "be more than a flower girl – I've been calling her my mini maid of honor."
"I have a friend who's the maid of honor but I wanted her to include Aubree in all the stuff possible, and I want her to feel like she has an important role," Houska explains.
Meanwhile, Houska can't believe how fast her little girl is growing up.
"She just lost her front tooth and there's another one she's about to lose, and for some reason that was a big deal to me," Houska says with a laugh. "When they get their grown up teeth they just look so much older! It's crazy."
And as for whether she sees more children in her future with DeBoer? They both "definitely" want kids, says Houska – but maybe not quite yet!
"We're just going to get through this wedding, and then hopefully have some babies!" she says.
"I feel like I want three more, but everyone always looks at me crazy when I saw that, so maybe I'll have one more and then we'll decide exactly how many!" she says, laughing. "I think I would want a boy somewhere in the mix."
Teen Mom 2 season 7 premieres Monday at 10 p.m. ET on MTV.