Justin Bieber has backtracked from his UFC challenge. Bieber recently challenged Tom Cruise to a UFC fight in a bizarre tweet last weekend. The post went viral, attracted Conor McGregor's interest who said he'd fight Mark Wahlberg on the same night, but failed to win over UFC fighters who said Cruise would beat Bieber. Now Bieber has admitted it was just a "random tweet," adding: "Tom would whoop my ass." He probably realized he was cruising for a bruising. Visit Business Insider's homepage for more stories. The June 10 tweet attracted 39,000 comments, 44,000 retweets, and 217,000 likes. http://bit.ly/2Ibj4IN http://www.wochit.com This video was produced by YT Wochit Entertainment using http://wochit.com 
