"Real Housewives of Atlanta" stars Phaedra Parks and Kenya Moore are butting heads ... over butts!

The two reality stars both released fitness videos claiming to enhance the backside, with Phaedra saying Kenya stole her idea after being dropped from the production.

Our friends over at Entertainment Weekly gave the nod to Kenya's "Booty Boot Camp" over Phaedra's "Phine Body" video, saying it's a better workout. Watch what happens when host Andy Cohen brings up the battling booty tapes at the "RHOA" reunion. Major shade is thrown:

After a relatively tame "Real Housewives of Beverly Hills" reunion, Hotlanta's will surely heat things up. Check out Part 1 this Sunday, and get a sneak peek of Kim Zolciak's return:

Whose booty do you back up?

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