The snap shows Kim signing her new name on a plate for a restaurant visited by the newlyweds.
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Kim Kardashian revealed her new signature in this photo taken on her honeymoon
"We were in Prague and we signed plates for the restaurant," Kim wrote alongside the photo. "This is the 1st time I signed West!! Xo."
It seems the 33-year-old practiced writing her new name beforehand; also visible in the picture is a napkin with 'West' written on it.
Kim Kardashian and Kanye West tied the knot on 24 May
"Had the best most relaxing romantic honeymoon in Ireland & Prague!" Kim, mum to baby North West, wrote upon her return to the US. "Missed my baby girl so much! Excited to be home to squeeze her so tight."