The 34-year-old television personality remarked on True's resemblance to Thompson after posting a new photo of the 8-month-old infant on Instagram.
Kardashian shared a picture of True sitting near her family's Christmas tree Wednesday, writing, "Her thighs" with heart-eye emojis. The post had received over 3 million likes as of Friday morning.
Thompson was among those to comment, writing, "My princess #MyTwin." Kardashian agreed with her boyfriend, responding, "she is completely."
"Auntie Kiki," she captioned the post.
Kardashian gave birth to True in April following reports Thompson cheated during her pregnancy. Kim recently said it's "awkward" for Thompson to relive the scandal on Keeping Up with the Kardashians.
"Unfortunately, that was what's going on in our lives," the star said on The Ellen DeGeneres Show. "So six months later, when it replays and they've gotten through what they needed to get through and it's rehashed in front of everyone."
"That is hard for Khloe, and I'm sure for Tristan, but it's our reality," she added. "We've learned to kind of use it as a therapy just to kind of get it out one last time with everyone else."