Kourtney Kardashian and Travis make-out in front of Scott Disick in epic awkward moment
The loved-up pair kissed and hugged at momager Kris Jenner's birthday bash, which was also attended by Scott, 38, who shares three children with Kourtney, 43.
Scott was invited to the party after he met Kris, 66, for lunch and said he was hurt not to be included.
Kris said at the lunch, "If you and Travis are cool, then…"as Scott said: "We're fine. For me to hear that you are having a little soiree and you don't think to invite me makes me feel like complete s**t, to be honest.
"I love you but how would you think I would feel?"
In a confession, Kris said to the camera: "Kourtney met her soul mate. That's gotta be hard for Scott to absorb, but I never expected him to be so angry and wound up over this. He just needs to grow up and be a little more mature."
When Scott arrives at the glitzy do he is welcomed by Kris and gives Khloe a hug.
The dad-of-three approaches the Blink-182 drummer, 46, and says "congratulations brother," before giving him a quick hug and handshake, as Travis responds: "Thank you, thank you."
Scott also gives Kourtney a hug and congratulates her again.
Kourtney confided in confession, "To be in the same room together is not a bad thing. It's a great first step for everyone and it will take time for everyone to figure out what makes sense."
However in one part of the episode, the pair kiss in the middle of a room with Scott appearing to see.
Kris, sitting at the dining table whispers to her guests, including TV host Ellen DeGeneres: "Scott's right there", then: "Oh this couldn't be more awkward."
The pair continue to kiss and hug, then head to the table.
In a confession, Kourtney said: "I know we were holding back, that I fully do know. Like we weren't just fully going for it. I didn't know that anyone was looking at us."
Scott then sits near the pair and watches with a blank expression on his face as Kourtney feeds Travis a piece of food and asks him what he wants to drink, before rubbing his back.
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Speaking to the camera in a confession, Scott comments: "She's found someone, I am happy for her. She's got a man that loves her and she deserves it, because there were so many years that I didn't put her first."
The pair have received flack for their PDA, and in one episode of The Kardashians, the family's new series, Kourtney addressed this, saying: "Kissing and hugging is not a bad thing.
“I'm actually grateful my kids can see a loving affectionate relationship because they haven't seen that their whole lives.”