As we all suspected, Justin Bieber was "just playing" when he challenged Tom Cruise to a UFC fight on Twitter. When TMZ caught up with him on Wednesday as he was leaving the L.A. offices of his wife Hailey Baldwin, Bieber admitted that he only sent that tweet about getting into the Octagon with Cruise after seeing him in an interview.   

"I don’t know him," Bieber explained. "He's tight. The story is I saw an interview with him, and he was just on my mind. It was just a random tweet. I do that stuff sometimes." He even confessed that Cruise would "probably whoop my ass in a fight." 

Bieber acknowledges that even if Cruise were to accept his challenge, the 25-year-old singer would need some time to get in shape. "I'm really skinny right now," he said. "I think he’d probably be out of my weight class." 

"He’s got that dad strength," Bieber continued, before asking, "He’s a dad right?" Cruise has three children; daughter Isabella, 26, and son Connor, 24, with Nicole Kidman, and 13-year-old daughter Suri with Katie Holmes. 

It didn't take long for Bieber to realize that jokingly challenging Cruise to a fight didn't go over well.