Kardashian, 32, and Thompson, 25, paid no mind to onlookers as they shared a steamy lip lock, filmed by one of their pals, Simon, aka @steezthegreatt. The Kocktails With Khloe host and the Cleveland Cavaliers star looked as happy as ever, taking breaks to flash smiles as Juvenile's "Back That A** Up" played in the background.
Earlier in the day, the two were spotted holding hands after they ate dinner together at Zuma with Kardashian's sister, Kourtney, and longtime pal, Jonathan Cheban.
"Khloe and Tristan were both in great spirits and extremely friendly to restaurant staff and diners," an eyewitness tells ET. "They appeared very happy together."
The crew then headed to AmericanAirlines Arena to watch Kanye West perform to an energetic crowd as part of his Saint Pablo tour.
"Yeezy taught me!" Khloe later captioned a cropped photo of herself, highlighting her bodyhugging white dress, thigh-boots and Nancy Gonzalez handbag, via Instagram. "#Yeezyseason."
Although the two have yet to officially confirm their status as a couple, this isn't the first time we've seen major PDA from Kardashian and Thompson. Earlier this month, they hit up Drake's Summer Sweet Sixteen tour concert at the Staples Center in Los Angeles, where they adorably slow-danced to the rapper's hit song with Rihanna, "Too Good."