Bieber was watching UFC 132 at the MGM Grand Garden Arena in Las Vegas on Saturday when he sent a series of Tweets that he was 'chillin'' with Dana.
That simple message had so many Bieber fans logging on to Dana's feed that the UFC boss's BlackBerry crashed.
It meant Dana's Twitter - which usually has regular updates on how the fights are going - went silent for the rest of the night.
But the UFC honcho seemed impressed with Bieber and has already made plans to meet up again, this time in Canada.
'good hangin with you last night too. See you in montreal,' Dana tweeted the pop sensation the day after the fights.