Watch Blac Chyna Awkwardly Run Into Ex Tyga and Kylie Jenner at Khloe Kardashian's Birthday Party

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Blac Chyna kept her cool when she ran into her ex Tyga at Khloe Kardashian's 32nd birthday party.

In a preview clip for Sunday's Rob & Chyna, the 28-year-old model was quite cordial when coming face to face with the 26-year-old rapper, who is the father of her son King, and his girlfriend Kylie Jenner, who also happens to be Rob Kardashian's sister.

"Hi, we finally made it, we finally made it," Chyna greets the couple with a hug.

WATCH: Blac Chyna and Rob Kardashian Snap Selfies With Kim Kardashian and Kylie Jenner at Khloe Kardashian's Birthday Bash

Kylie, 19, says she's "so glad" that Chyna and Rob are at the party, because she "didn't think" they were coming.

"Here comes Kylie and Tyga," Chyna later says to camera. "I kinda talked to them for a moment because this is going to be my future sister-in-law."

WATCH: Rob Kardashian Admits He's Scared Blac Chyna Will 'Stop Being Attracted’ to Him Because of His Weight

Meanwhile, Rob doesn't appear to be enjoying himself at the party. "Everyone is swarming Chyna and I, and it's all love, I get it, it's all great, but it's just exactly what I did not want," he admits. "I just feel a lot of eyes are on me, and I just wish everything could be just normal and we just focus on Khloe. I'm not about the whole, like, theatrics and stuff."

Later on in the party, after Chyna greets Tyga, she says she can tell something's "wrong" with Rob. The 29-year-old reality star insists that he's "good," but then asks his fiancee, "You feel like leaving?"

WATCH: Blac Chyna Questions Her Relationship With Rob Kardashian -- ‘Part of Me Wants to Take a Paternity Test’

On an August episode of Keeping Up With the Kardashians, Khloe revealed why she decided to invite Chyna to her birthday party. "I don't really know Chyna ... and I wanna change that," she explained. "I want to make everything happy and that we're all just accepting of one another."

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