The 17-year-old shared a snap showing her newly blue do while at Bellami Beauty Bar, in Hollywood on Thursday 9 July.
Within four hours the photo had received 917,000 likes and 32,600 comments.
Kylie's 19-year-old sister Kendall currently holds the record for having the most liked Instagram post of all time- a title she earned when the selfie below amassed a staggering 2.6m likes in just one month.
Only time will tell if Kylie can beat this record, but in the meantime, Kendall has shown that there are no hard feelings over the hair competition by sharing the photo below of her little sister, which she captioned: "Babe, you're blue."
Kylie's hair was styled by Tokyo Styles, a man known for his work with wigs and hair extensions, so Kylie may well be back to her dark hair soon.