Reality star Kim Zolciak isn't the only one holding out on her wedding planner as her former frenemy NeNe Leakes has joined the non-paying 'wedding planner' team.

The 'Real Housewives of Atlanta' breakout star is being sued by her celebrity wedding planner, who claims she racked up a MILLION DOLLAR bill for her big day....and never paid.
According to the suit, filed by Tiffany Cook in Georgia, claims "NeNe hired Dream Design Weddings to coordinate the party for her marriage to Gregg Leakes on June 22, 2013...a wedding that will be featured on Bravo in September.


Cook adds, "Mrs. Leakes promised to pay me 15% of the entire wedding budget PLUS fees design and execution of the wedding PLUS travel expenses to the event.
TMZ reports,

In total, Cook claims NeNe's budget for the wedding was $1.8 MILLION!!!!!!!!! And Cook claims she was due $270k (the 15%) PLUS another $889,900 (design fees) PLUS $1,750 (4 coach tickets from Florida to Georgia).

Cook claims NeNe did fork over the initial down payment ($18,750) ... but she hasn't seen a penny since -- and is suing for the remaining $1,142,900 balance ... PLUS damages.

In total, Cook -- who also put together Kordell Stewart's wedding to Porsha -- wants more than $2.5 MILLION for her troubles.

How's THAT for a wedding gift??

A rep for NeNe tells TMZ ... Cook was NOT the wedding planner, it was a man named Tony Conway, who made Nene's wedding spectacular.

The rep adds, "This lawsuit has no merit and it appears to be a baseless attempt to grab 15 min of fame."

And in the meanwhile, NeNe and Gregg are currently on vacation and has been keeping fans up-to-date with their every move:
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Random...check out the gif party below: