Tristan brought Khloe to the Blind Dragon lounge in West Hollywood, where Kim, Kanye and the other guests were waiting. Kim shared photos from the evening on Snapchat, including several photo booth shots.
Khloe and Tristan were first linked in October following their respective splits from James Harden and Jordan Craig. Khloe said on the June 11 episode of Keeping Up with the Kardashians that Tristan wants "five or six" kids with her.
"He wants to have kids now," the reality star told Kim.
"Tristan and I definitely talk about starting a family," she added in a confessional shot. "He wants to have five or six kids with me and that's lovely. We could start at one and we could grow from there."
Tristan is already dad to 6-month-old son Prince with Craig, who was pregnant at the time of their split. Khloe previously discussed her desire to have children with the NBA star in the April 13 issue of ES Magazine.
"I would love to have a family. We've talked about it," she shared. "He [already] is a father, and I know for a fact that he would be an impeccable father. I definitely want to be a mom. But I don't put the pressure on it."