Kim Kardashian's feud with Kourtney Kardashian is so last season. 

Now, the SKIMS designer is sparring with younger sis Khloe Kardashian, who she called out for having a "stick up" her "ass" in the season five premiere of The Kardashians. (For a breakdown of all the must-see Kardashians moments, watch Kards Katch Up here.)

As seen in Hulu's May 23 episode, their beef started in September when Kim decided to fly to Paris for 12 hours to support Victoria Beckham's fashion show. And although she invited Khloe to come along, it was a hard pass for the Good American founder.

"There are a couple things that are holding me back from wanting to go to Paris," Khloe explained in a confessional, pointing to her kids' school routine and the final weeks of Kourtney's pregnancy with baby Rocky. "I feel like someone has to be here, even for all the kids. Like, God forbid there is a natural disaster, I just feel like somebody has to be here. I know I'm an over-thinker. I know I'm insane. Welcome to my mind."

It's just one of the differences that Khloe—who shares kids True, 6, and Tatum, 21 months, with ex Tristan Thompson—sees between her and Kim.

"Kim can fly by the seat of her pants, but I'm not gonna change who I am," she added. "I was like, ‘You know what? I actually don't care to do this.' I would rather be with my kids."

Kim, on the other hand, doesn't see a problem with her workaholic ways—which included flying to New York for six hours before her whirlwind Paris Fashion Week experience, then jetting stateside to Atlantic City and back across the pond to Milan, all within five days.

"People are like, ‘Why do you work so much?' Like, OK, yeah, that's my vice, but what else do you want me to be doing?" the mom of four said in a confessional. "Do you want me to be doing drugs? If I'm addicted to working and being busy, I don't think that's the worst thing. How about, let me do what I want to do. You do you. I'll do me."

But while Kim wants critics to get off her back, she couldn't help but weigh in on Khloe's lifestyle. Calling her sister "unbearable," Kim bemoaned Khloe's choice to skip the Paris getaway.

"She needs to get out and live her life," the 43-year-old noted. "All arrows are pointing towards misery. She feels guilty for leaving."

In fact, Kim thinks that Khloe is "so stuck in a routine" that she's missing opportunities in her own social life.

"She's not gonna meet anyone in carpool. She's not gonna meet anyone at drop-off," the American Horror Story actress retorted. "She's only gonna meet people when she does adult things. I think Khloe would be happier if she wasn't so rigid about a schedule."

And although Kim wished Khloe was joining her in France, she ultimately thought her absence was for the best.

"When you're not feeling it, there's nothing that can force you to come and have a good time," she shared. "Like, you will just be miserable. I'm not in the mood to deal."

Read on to see more celebrities Kim has feuded with over the years.

In a bold move, Moretz commented directly on the reality star's NSFW photos, telling the mom, "I truly hope you realize how important setting goals are for young women, teaching them we have so much more to offer than just our bodies." Clearly, the advice wasn't appreciated, with Kim replying, "Let's all welcome @ChloeGMoretz to twitter, since no one knows who she is...your nylon cover is cute boo." Since then, relations between the two have been icy. Luckily, Chloë nabbed herself a KKW perfume since she was on the haters list.

Where to begin? Besides the incident at the VMAs, people can recall the infamous feud that ignited between Kanye West and Taylor Swift after the latter was referred to as a bitch in the artist's song "Famous." Swift released a statement saying she wasn't aware of the lyric "that bitch," but Kim was quick to defend her hubby and shared an edited video of the singer talking on the phone with Kanye West. Since then, there has been nothing but bad blood between the former couple and the singer.

Again, the Keeping Up With the Kardashians star was criticized for her nude selfie, but this time it was from Pink. In a subtle shade, the singer tweeted, "Shout out to all of the women, across the world, using their brains, their strength, their work ethic, their talent, their ‘magic' that they were born with, that only they possess. It may not ever bring you as much ‘attention' or bank notes as using your body, your sex, your tits and asses, but women like you don't need that kind of 'attention.'" Kim later wrote an open message on her app, saying, "In all seriousness, I never understand why people get so bothered by what other people choose to do with their lives. I don't do drugs, I hardly drink, I've never committed a crime—and yet I'm a bad role model for being proud of my body?"

Wendy really stirred the pot when she questioned the happiness in Kim's marriage on her show. "Kim, you know what? It's clear that Kanye has nothing for you except dribble and feeble conversation… It is clear that Kanye does not pay attention to you. It's clear to me that you are desperate, desperately trying to stay in the spotlight." Surprisingly, neither Kim nor Ye responded to the shade, but Williams was among the haters gifted KKW fragrances.

It was the tweet heard across the world. Midler tweeted to her followers, "Kim Kardashian tweeted a nude selfie today. If Kim wants us to see a part of her we've never seen, she's gonna have to swallow the camera." And in an epic two-part clap back, Kim tweeted, "hey @BetteMidler I know it's past your bedtime but if you're still up and reading this send nudes #justkidding."

In a reference to Kanye West's tweets about being in debt, Piers tweeted, "I know the old man's $50 million in debt, Kim - but this is absurd. Want me to buy you some clothes?" In response, Kim fired back, "hey @piersmorgan never offer to buy a married woman clothes. That's on some Ashley Madison type s--t #forresearch."