Ne-Yo To Baby Mama -- We Did The Deed ... Now You're On My Penthouse Deed

Ne-Yo is a badass baby daddy ... because he just let the woman he knocked up a couple of times become the co-owner of his $1 mil condo.

TMZ obtained docs that show the R&B singer just put Monyetta Shaw -- with whom he shares 2 kids, Madilyn and Mason -- on the deed of his Atlanta high-rise condo.

We're told Ne-Yo made the very expensive gesture to make sure his kids would live in comfort.

It sounds comfy ... 3,001 sq. ft. with 3 bedrooms, 3 1/2 baths, a 24 hour concierge, full gym, swimming pool with sun deck, a tennis court and a load of other goodies.