AceShowbiz - Kristin Cavallari is ready for another round of motherhood now that she's in a relationship with a much-younger boyfriend. "The Hills" alum has revealed that she's open to having another child amid her romance with Mark Estes.

The 37-year-old talked about the possibility of her having a kid with her new beau in her "Let's Be Honest" podcast. "I'm not actively thinking about it, but it's definitely in the back of my mind, is, you know, he wants to have a kid," she began. "I'm mulling it over."

When her friend Justin Anderson responded, "I see you having another kid. And my goodness, could you imagine that baby?" Kristin teased, "That's why I might have to do it." She went on to note, "But my kids are old enough now where they can help. That would be nice. If he ends up really being the one, I would have a kid."

Justin then asked, "Are you for real thinking about this?" In response, the fashion designer stated, "Yeah, I have to. I mean, yes. It's become pretty serious, this relationship I would say."

Kristin and Mark confirmed their romance on February 27. At that time, the TV personality shared a selfie of the two on Instagram during their trip to Cabo San Lucas, Mexico. She captioned the post, "He makes me happy."

Kristin affectionately refers to Mark as "Montana" and revealed that he met her three children before their first official date. Despite the initial shock of their age gap, Kristin's children are excited to see her happy.

Mark himself has defended their relationship. "She makes me happy, I make her happy," the member of the Montana Boyz told E! News in an interview. "That's what's important, so I'm not too worried about the critics, honestly."