'RHOA' Star Porsha Williams is NeNe's New Neighbor

Porsha Williams really is tied at the hip with her 'RHOA' co-stars ... 'cause she just bought a mansion 2 minutes away from NeNe Leakes.

Porsha dropped $1.15 million on her new Georgia pad, and showed she's business savvy in the process -- since the asking price was $1.275 mil.

At 5,920 sq. feet ... the 5 bed, 7 bath spread comes with 5 fireplaces, a huge chef's kitchen, plus gorgeous millwork throughout. Like we said, she's now in the same gated community as NeNe -- just across the country club golf course.

Reality stars gotta stick together ... in sickness and in wealth.