The 33-year-old reality star announced the news on her Instagram page, sharing a new passport photo that shows off plenty of her famous cleavage.
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'New passport pic #Mrs.West #NameChange,' Kim captioned the photo.
Following her nuptials in May, Kim has now officially dropped her maiden name of Kardashian from legal documents, but will be known as Kim Kardashian West.
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On Tuesday Kim also revealed that she's still unhappy with her size, a year after giving birth to daughter North West.
Taking to her Twitter page, the star wrote: 'Off to an intense workout. Can't seem to shake this last 15-20lbs of baby weight, no more excuses. my baby is 1 years old! UGH.'
'I'm not gonna call it baby weight bc thats an excuse. i just gained weight & that's it. why it is so much harder to lose after baby though!!' Kim lamented.
'Just need to get down to my weight a few years ago. Not gonna complain anymore. Starting diet TODAY! No carbs. crazy workouts. Who's with me?'
She later added that her sister Kylie Jenner was trying to make her eat carbs while out at dinner.