The Keeping Up with the Kardashians star posted this hilarious photo from their teenage years on Instagram yesterday.
"#ThrowbackThursday @nicolerichie and I being oh so cool at 13 years old," Kim captioned the shot, where Nicole's sporting braces.
This reminds us of another blast from the past: when Kim was best friends with Paris Hilton, who was also once Nicole's BFF and her costar on The Simple Life.
Kim's face and her nose in particular look so much different to us now, but Kanye West's 33-year-old fiancee has denied having any plastic surgery done.
Kim's sister Khloe also posted a funny Throwback Thursday photo with a famous friend: Miley Cyrus!
"TBT to when Miley punked me!" she wrote on the pic of them laughing and hugging.
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Gallery | Kim Kardashian's Famous Friends