The Kardashians have quite a tangled past with Blac Chyna! Not only is Rob Kardashian's fiancée the mother of Kylie Jenner's ex-boyfriend Tyga's son, but she also used to be best friends with Kim Kardashian. We can only imagine how awkward it must have been for Kim when Tyga left Chyna for the youngest Jenner sister.
What makes things even more complicated is that Chyna is now best friends with Amber Rose, who's Kanye West's ex. Awkward!
Click through the gallery to see throwback pics of Kim and Chyna when they were besties.