The 27-year-old NBA player posted a photo with Kardashian and 6-month-old daughter True while celebrating Halloween on Wednesday.
Thompson, Kardashian and True look the happy family in the picture on Instagram Stories. The couple dressed up True in a pink flamingo costume.
"Clearly I don't know where the camera lense is lmao," Thompson captioned the post.
The Cleveland Cavaliers star also shared a snapshot of himself holding up True.
"Happy Halloween," he wrote.
In addition, Kardashian posted photos of True in various Halloween costumes on her own account.
"Khloe and Tristan are great," a source said in September. "They had an amazing summer together and a gorgeous family vacation."
"Vacation has already ended and Tristan has to be back in Cleveland for the new season," the insider added. "They are all moving back to Cleveland, and it's hard for Khloe. She will really miss Kris [Jenner] and her sisters."
Kardashian gave birth to True in April following reports Thompson cheated during her pregnancy. She said this week that reliving the scandal on Keeping Up with the Kardashians is a "very hard" experience.