The celebs are flocking to T-Mobile Arena to check out Conor McGregor and Dustin Poirier's big trilogy fight ... and Kourtney Kardashian and Travis Barker simply couldn't wait for the main event to provide a TON of action!!!
As we previously reported, all the biggest names in Hollywood are hitting up UFC 264 -- with President Donald Trump, Justin Bieber, Megan Fox, MGK, Kourt and Travis, Kevin Durant and more showing up for the bout.
KK and TB decided to put on a show as everyone got into fight mode -- straight-up making out as the camera panned to their area.