Cyborg retained her featherweight championship belt after winning a unanimous decision in the 5-round title fight. Cyborg had a lot to celebrate ... she dominated the fight from start to finish, leaving Holly a bloody mess.

She's mugging next to a Buddha in the club located on the top floor of the Mandalay Bay.

Check out those victory pants!!!

BTW ... Cyborg was on the FS1 TMZ Sports show a week ago ... she's fierce in the octagon but super sweet.