Conor McGregor and the Paul brothers have apparently put their beef aside in the name of Donald Trump ... 'cause the trio of combat sports stars are currently chummin' it up at DT's inauguration!!!
The guys -- who've exchanged plenty of inflammatory remarks about each other over the years -- were all smiles as they headed toward Capitol Hill on Monday for The Donald's big afternoon in D.C.
McGregor actually sat next to Jake and Logan's mom while they were on their way to the festivities .