Most celebs would be too embarrassed to up a hot Hollywood nightclub with a black eye -- but most celebs aren't Nate Diaz.
The UFC superstar was proudly sporting his shiner from the McGregor fight as he hit up the legendary Hyde lounge on the Sunset Strip with his brother Nick Diaz.
The two were in a GREAT mood -- partying with a massive entourage.
In fact, we saw the gang hittin' a liquor store after the club -- we're guessing they were gearing up for the after party.
To the victor .