Kylie Jenner is usually the one known as the "mean girl" - but did she just get a taste of her own medicine? On camera?? The 28-year-old was one of many attendees at her sister Kendall Jenner's lavish 30th birthday party. In a TikTok recorded during the bash, she could be seen singing and dancing along with friends, including enjoying a performance by Justin Bieber. But during a moment where she was having fun, two of her pals seemingly dissed her behind her back! That's what a lot of fans think, anyway...