McGregor and Branson came face-to-face because of an event at the Pendulum Summit in Dublin's Convention Centre.
Father-of-one McGregor, 29, was presented with a lifetime achievement award for his accolades in sports as well as business.
Not to be outdone, Rich ripped off his top too. and we gotta say, dude looks pretty frickin' jacked for a 67-year-old gazillionaire.
McGregor shares his epic face-off with Branson on social media.
INSTAGRAMJohn Kavanagh filmed himself watching Khabib Nurmagomedov's bout with Gleison Tibau earlier today
In the footage, the Dubliner goes to accept his gong but the presenter tells him he must take his shirt off before he receives it.
Ferguson is now on a 10-fight win streak and has not lost since 2012.
Russia's most popular fighter, undefeated lightweight Khabib Nurmagomedov, who was victorious on the UFC 205 card against Michael Johnson, has always been rumored to headline an event his home country.
That is not OK with White, so he is putting a deadline on McGregor and using the champ's belt to do it.
"I think that Conor, Diaz, and Ferguson, instead of fighting with Khabib, will be better off fighting against each other 30 times", Abdulmanap said. "Or if Conor doesn't want to fight and wants to sit out until next fall, then we would have to make Khabib vs".
Mnuchin defends Trump's planned Davos trip: It's not 'a hangout for globalists'
Earlier this week, it was reported that President Donald Trump planned to attend the World Economic Forum in Davos, Switzerland. The former Goldman Sachs banker and Hollywood financier added "the economy that is good for the U.S.is good for the world".