NeYo and his baby mother Monyetta Shaw threw a joint birthday party for their 8-year-old kids, Madilyn and Mason. The party was in Atlanta - and it was a fun, and VERY EXPENSIVE event.

NeYo and Monyetta rented out an entire fun house in Atlanta - more than 50,000 square feet - and reserved it just for their kids and their friends.

And it wasn't just NeYo and Monyetta there. NeYo brought his new wife Crystal - and their two children.

Crystal allegedly first started dating NeYo - when he was with Monyetta. But that was a long time ago, and everyone seems to be over it.

Monyetta and Crystal seemed to get along great. Not only did the two moms pose for pics together, but Crystal was seen helping Monyetta arrange the event.

All in all - they were one happy family.

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Back in June NeYo welcomed his fourth child with wife Crystal. 

Ne-Yo said that being a dad hasn’t changed his life too much, other than causing him to lose some shut-eye: “I don’t sleep at all now. I didn’t sleep much before. Now I don’t sleep at all. No, in all honesty, it really hasn’t changed me at all. Now I’ve got people to act goofy with. You know what I mean? We jump on the bed together, and then the wifey comes and I’m like, ‘Hey, guys, get off the bed. Stop doing that.’”

The “So Sick” singer might not be done adding to his brood, either. “Slow down!” Ne-Yo laughed when asked if he and his wife of two years would try again to have a daughter.