Kim Kardashian West has apologized after comments on social media featuring derogatory language upset her fans.

And it's not the first time the reality star has put her foot in her mouth - in fact, it's not even the first time this year.

The latest controversy began on Halloween, when Kim shared a video of herself dressed up as actress Pamela Anderson at her sister Kendall Jenner's costume party.

"It's actually an offensive term [to] a vulnerable population of people with intellectual disabilities."

The reality star filmed herself asking Jenner's guests to guess her costume, and her Instagram videos of the event show several people were stumped.

But after a few incorrect guesses, Kim began loudly complaining.

"Nobody here knows who we are here!" she said in one. "You guys are all too ---- young. This is so sad."

In another video, which has since been deleted, Kim even complained to her former assistant Stephanie Shepherd that, "Nobody know who I am. Yah! R------d."

This is a copy of the video which featured the offending word.

Fans were quick to criticize Kim for her use of "the R word," which is widely agreed to be derogatory and offensive to people with developmental disabilities and learning differences.

"R----d is not a synonym for stupid. It's actually an offensive term [to] a vulnerable population of people with intellectual disabilities [and to] those who love them," one user wrote on Twitter.

"That was a really unnecessary use of the word," said another. "I think we should all know & do better by now. It breaks my heart and angers my soul when I hear that word thrown around, knowing the pain that it carries."

The social media backlash seemed to reach Kim, since she deleted the video on Thursday and issued a public apology for her comments to several news outlets.

"I want to apologize for what I said in a recent video post," it began, "that is inappropriate and insensitive to the special needs community."

"I try to learn from my mistakes and this is one of those times."

She also asked fans to "know that my intention is always pure, and in this case, it was a mistake. I'm sorry."

It's not the first time using hurtful language has caused trouble for the Kardashian sisters, as Kim's younger sister Khloé had to apologize for using the same word in a video posted earlier this year.

"Ugh I hate that word! Why did I even say that?" she wrote in a tweet to a fan who criticized her.

"You are a million percent right and I actually greatly dislike when people use that word! I will do better! I am sorry!"

"Looking back, having said that, I 100% completely understand where people are coming from."

Kim's latest apology for something she said in a social media post follows another public apology from earlier this year.

In that case, Kim seemed to be making light of eating disorders like anorexia, after mentioning that she weighs just 119 pounds in an Instagram video.

"I don't think you're eating," her younger sister Kendall Jenner commented. "Like you look so skinny."

"Kimberly, I can literally see through you!" Khloé added. "But she's anorexic here, her arms are like pin thin, they're like my pinky."

Kim seemed to appreciate the comments about her small size, saying, "Oh my god the compliments!"

In October, while being interviewed by model Ashley Graham, Kim clarified that she was only joking with her sisters, and didn't mean to offend anyone.

"Looking back, having said that, I 100% completely understand where people are coming from," she said. "My intention is never to offend anyone and I apologize if I did that."

"I know people who have serious eating disorders who have been in and out of the hospital for 15 years," she added. "Close people. I've experienced it enough to know better."

Kim also landed in hot water earlier this year for posting an Instagram comment some fans complained was homophobic.

The reality star was in a war of words with male model Tyson Beckford, after he left a mean comment about Kim's looks on a paparazzi photo of her.

"Sorry, I don't care for it personally," he wrote. "She is not real, doctor f-----d up on her right hip."

"Sis we all know why you don't care for it," Kim replied. Readers thought she was suggesting that Beckford is gay, and criticized her "homophobic response."

[H/T: USA Today, People]

Was Kim's apology for her rude comments enough?