We love know-it-all Teddi Mellencamp on the Real Housewives of Beverly HIlls and we love even more that she's pregnant with a baby know-it-all!

If this third child is as adorable as the first two John Mellencamp's offspring has with hubby Edwin Arroyave, the kid is SET! Slate, 6, and Cruz, 5, make regular appearances on the Bravo reality show and they are CUTE! Arroyave also has a daughter Isabella, 10, from a previous relationship.

I’m in my second trimester, 14 weeks,” Teddi tells Us Weekly. Mellencamp initially kept her pregnancy “under wraps," but now says, “Everything’s good and I’m in the clear, so I’m just starting to get to that point where I’m sharing with everybody. Plus now I have a bump, so there’s not much more hiding I’ll be able to do!"

Now here's a super cool thing ... Teddi and Edwin used IVF to conceive their first two children but this time, the pregnancy happened naturally and by surprise! "My husband said, ‘I don’t want to see you going through IVF again — that was brutal.' It was so many rounds, but this time we really weren’t doing anything! I was on vacation! Just having fun with my family! It was a complete surprise. I didn’t even know I was because I didn’t have a regular cycle."

Congrats to the happy couple!