• FS1
    9:00 PM PST

    9:30 PM PST

Nick Jonas He'd Kick Justin Bieber's Ass ... Says 'Kingdom' Co-Star

12/26/2015 12:45 AM PST

Nick Jonas: He'd Kick Justin Bieber's Ass ... Says 'Kingdom' Co-Star


Justin Bieber's career is on fire but there's still one thing he can't do ... kick Nick Jonas' ass ... that's according to Nick's "Kingdom" co-star Frank Grillo who says the JoBro's a total "badass" thanks to his MMA training.

Frank witnessed the transformation Nick went through playing an MMA fighter on their show, so when we got him out in L.A. we had to ask ... is Jonas now the toughest teenybopper alive?

Check out the clip -- Frank must've had Bieber on the brain cause we didn't even mention Justin ... but Grillo seems convinced -- and proud to say -- that Jonas would beat the Biebs to sleep. 

Careful, Frank ... the Beliebers are watching.

Watch TMZ Sports on FS1 Get the new TMZ Sports app!


Click To View
Hot Video

More From

Around the Web