Travis Kelce isn't exactly lighting up the celebrity golf tournament in Nevada on the green ... but, he's pretty lit himself -- pounding beers with his pals.

The retired Philadelphia Eagles star, 37, and his younger brother, 35, took part in the American Century Championship in Lake Tahoe. During the golf event on Friday, July 11, Jason shared that he considers Travis his "best friend on the planet."

Jason and Travis Kelce were ready to compete in some celebrity karaoke in Lake Tahoe. They just had one obstacle in front of them: Ray Romano.