The 32-year-old socialite, who recently gave birth to a daughter with rapper boyfriend Kanye West, has abandoned her brunette locks and was sporting the new look at a friend's Beverly Hills barbecue party, reported E! online.
"It is something she has wanted to do for a long time. I've been coloring her hair for a year, and she has wanted to go blonder since the day we met," her colorist George Papanikolas said.
The colorist also revealed that West likes the new locks of his girlfriend.
In 2012, the 'Keeping Up with the Kardashians' star had changed her hair colour to a lighter shade.
"I dyed my hair lighter yesterday! I'm loving it! New hair colour equals to new beginnings for me. You like?," Kim had tweeted at the time.