And an onlooker claimed the pair were being openly affectionate towards one another.
The source told People magazine: "Travis and Kylie were being very sweet and cute together. They were holding hands and seemed fully back on."
The event marked the first time Kylie and Travis have walked the red carpet together since the premiere of the Astroworld hitmaker's Look Mom I Can Fly documentary in August 2019, two months before it was revealed they were "taking space apart" from their relationship.
They sparked speculation they were back together last month when they were seen out in Los Angeles' Catch with Kylie's sister Kendall Jenner and her boyfriend Devin Booker, and friends Justin and Hailey Bieber.
Kylie also accompanied Travis and Stormi on a trip to Houston, Texas, to see his family.
And the reunion may not come as a shock to many because in February it was reported the pair weren't "ruling out getting back together".
A source said at the time: "Kylie and Travis are still madly in love. You can tell every time they are together that there is a lot of love there. Both of their faces light up when they are together and both seem very happy."