Atlanta is longer big enough for two of reality television’s best-known Southern belles. Smart-talkin’ socialites and occasional besties Kim Zolciak and NeNe Leakes are “too through” with The Real Housewives of Atlanta, The NY Daily News’ spilled in Friday’s “Gatecrasher” column.

Sources with the smash Bravo reality series say Kim and NeNe are demanding megabucks to return for a third season of RHOA in 2010, but the ladies’ demands for cash are roaming way out of the network’s range. After weeks of crunching numbers, producers have hit an impasse with the dolled-up divas and are ready to call in the big guns — new cast members!

“Bravo has been taking meetings with some notable and wealthy Atlanta women about possibly joining the show,” The Daily News informant whispers. “They’re trying their best to keep the process under wraps, but they’re gearing up to make a major move in the third season.”

Tattles say the network is holding casting calls for a possible sixth Housewife –who could replace NeNe and Kim next season.