Justin Bieber takes a swipe at Eminem....

Justin Bieber has taken a swipe at Eminem, claiming the musician 'doesn't understand the new generation of rap.'

The Sorry hitmaker, 25, squared up to the Stan rapper, 46, on his Instagram story after posting a screenshot showing he was listening to Eminem's The Ringer from his latest album Kamikaze.

The album, which hit the number spots on the UK and US Billboard charts, features several diss tracks aimed at artists including Machine Gun Kelly, Joe Budden, Lil Yachty, Lil Xan and Lil Pump.

Hinting that Eminem is behind the times, Justin defended the artists, writing: 

I just like Em's flow but don't like that he's dissing new rappers. I like the new generation of rap, he just doesn't understand it .