Kristin Cavallari and her boyfriend Mark Estes are clearly pretty serious ... 'cause not only has she introduced him to her kids -- but it seems they've got a rapport!
The mother-of-three shared a picture to Instagram Sunday featuring her new 24-year-old beau with one of her kids ... and they seem deep in conversation while Mama Cavallari is able to hang back a few steps.
KC didn't add anything in the way of words to the pic ... but she did drop a white heart emoji on the photo -- so clearly she's pretty happy with the chummy bonding going on.
BTW ... unclear which of Kristin's sons this is -- but, ya gotta imagine she introduced Mark to them at or around the same time, and it was long enough ago that one of her kids can seemingly hold a convo with him comfortably. Kristin shares three children with her ex, Jay Cutler.
It seems like things are movin' along quickly between KC and ME ... remember, Cavallari only revealed they were dating at the end of February -- so things have seemingly progressed quickly between the two.
It makes sense when you consider it seems almost like fate was pushing these two together ... Kristin recently revealed on her 'Let's Be Honest' podcast that she first spotted Mark on TikTok with his crew The Montana Boyz.
Weeks after spotting the hottie, Kristin got a DM from one of the guys. She invited the group on her podcast, hit it off with Estes and they started seeing each other. Talk about a 21st century fairytale!
Anyway, it seems a stray DM has now turned into contact with the kids ... and, we'll just have to wait and see where the loved-up couple goes from here.