6 Epic NeNe Leakes-Kim Zolciak Fights in Honor of 'RHOA' Season 10 Premiere
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More of the Worst Celebrity Feuds Ever!

The Bravo reality series returns Sunday along with two of the show's most entertaining -- and fiercest -- housewives. Here's a refresher of their beef.

"The Real Housewives of Atlanta" returns to Bravo this Sunday along with two of the original cast members, NeNe Leakes and Kim Zolciak, who have a lot of history sure to make Season 10 extra dramatic.

NeNe and Kim have famously had a very on-again, off-again (mostly off-again) friendship since before they were co-stars on the reality show and well after they each left the series.

As recently as last month, NeNe went off on Instagram after coming across a Snapchat video of Brielle Biermann -- Kim's oldest daughter -- criticizing her bathroom. The video footage also showed bugs inside the house.

"We don't have roaches! If you found 1, u brought it with u or it fell outta yo funky pussy," NeNe wrote in a since-deleted Instagram post. "Please know I will get You all the way together when you start fu-king wit me and mine! Go somewhere and let the air outta those fake lips, fake titties and fake ass because you will never be @kylejenner. You had to stoop so low and be so disgusting #racisttrash #jealous #KKK #thirsty you better run yo ass back to a child's place."

Kim clapped back, explaining that NeNe was the one who released the video and that she would "take the high road."

Fast-forward to this past Halloween: NeNe dressed up as an exterminator and her husband wore a cockroach costume.

Below are five more epic fights between Kim and NeNe you need to relive before their return to "The Real Housewives of Atlanta" Sunday night.

The Bus Fight

The ladies took a trip to Miami for some meetings and events related to Kandi Burruss and Kim's respective music careers. During the bus ride down, NeNe got upset that Kim brought her assistant along because she felt the trip should be a "RHOA"-only trip. The conversation quickly turned into NeNe popping off at Kim for treating her then-assistant Sweetie Hughes "like a slave."

"The way that Kim is treating Sweetie is very unacceptable to me," NeNe told Bravo cams. "I don't like it. Not only are you disrespecting Sweetie, you are disrespecting me, and she's a fool for sitting here letting you talk to her like that. Somebody need to step in."

Kim then accused NeNe of being jealous of her success.

"I would much rather be trying to make a living for my own self than be a mistress sleeping with somebody else's husband," NeNe said.

Season 1 Reunion Almost Gets Physical

During the Season 1 reunion, Andy Cohen asked Kim about her singing career and the album she was getting ready to release. NeNe -- who had said all season long that she didn't think Kim had talent as a singer -- restated those thoughts.

"I heard her sing, and I don't think she can sing," Nene said to Andy. "Now, this is my opinion. I'm free to state my opinion any time I like, right?"

When Andy asked Kim about her then-relationship with the mysterious Big Papa, NeNe went off again, saying she had heard Big Papa was saying things about her.

"Close your legs to married men," NeNe said to Kim three times. "You heard it. You're the one that's trouble. You're the one that's going around lying on everybody. You are lying. Every chance you get, you lie. You better not lie around me. Lemme let you know something 'cause you made a comment already that you would beat my ass. I'd like to see that happen. I'd like to see that happen."

The screaming match escalated, and NeNe had to be restrained by Shereé Whitfield.

Kim Calls Out NeNe's House-Shaming Tweets

During the Season 5 reunion, Kim attacked NeNe for tweeting about her renting her home.

"Bitch, I do. But guess what? We're closing next month," Kim said. "We bought the house."

When Andy asked NeNe why she cared about whether or not Kim bought or rented her house, NeNe said, "I don't give a sh-t. I tweet about whatever I want to tweet about. This bitch is always trying to talk sh-t. You talk sh-t on you timeline all day long about people, but as soon as somebody say something about you, you get so defensive!"

It would be impossible to accurately recap the war of words, so take a listen for yourself.

Kim's Dramatic Exit From 'RHOA'

During filming Season 5, Kim stormed out of a restaurant where the women were having lunch/arguing over the specific dates of a trip that an eight-month-pregnant Kim took. The argument was spearheaded by NeNe.

"I'm done," Kim said as she took off her mic and stormed out to the car where her husband Kroy Biermann was waiting. Kim grabbed the camera of one of the crew members who followed her outside and yelled, "F-ck you! Get out of my f-cking face!"

Kroy then echoed his very pregnant wife's sentiments and threatened a lawsuit.

"I've just had it," Kim told Bravo cams. I don't need this f-cking drama. These bitches are not my friends."

Kim's Calls In to NeNe's 'WWHL' Interview

This was a pivitol moment for the women, and although it didn't happen on "RHOA," we're including it anyway.

NeNe was a guest on "Watch What Happens Live" talking about Kim when Kim called in.

Kim could hardly get a word in before NeNe started yelling, "Close your legs to married men, trash box! Close your legs to married men. Bye, trashy! Do what you need to do, trash box. Goodnight!"

"You called me a drag queen, trick. You got it wrong because you called me a drag queen. I am a beautiful drag queen, boo. You need to go somewhere. You're the one that called me a drag queen, and I think that it was a compliment. Thank you! Now go to sleep, wig. And close your legs to married men. Night night!"

Kim tried to get a few more words in before NeNe started chanting, "Close your legs to married men!"

"Come up with something a little more original, NeNe," Kim said.

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