Kristin Cavallari may be a new mom in the future -- at least that's what she's saying ... 'cause her boyfriend wants to have kids.
The reality star explained on her "Let's Be Honest" podcast that her 24-year-old BF, Mark Estes, has his sights set on being a dad -- and because of this, she's been mulling over potentially popping out another baby with him, assuming everything works out.
So far it looks like Kristin -- who's currently 37 herself -- might be leaning towards expanding her brood .