If people in the music industry have learned one thing across the decades, it's to not mess with Eminem.

Over the years, we've seen many a musician come up against the rapper and get burned - this includes Mariah Carey, Limp Bizkit, and Will Smith. But it appears that some still haven't got the message and are lining up to take on the infamous sharp-tongued Slim.

This week, none other than Justin Bieber stepped up and took a shot. Sharing a screenshot to his Instagram story that showed he was listening to Eminem's 2018 song The Ringer, Justin claimed the 46-year-old star "doesn't understand" new rappers.

"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," he wrote.

The Love Yourself singer was starting up what could turn out to be a fabulous celebrity feud - but don't get your hopes up, as the whole thing allegedly just made Eminem giggle.

Speaking to HollywoodLife, a source has claimed that Slim Shady "doesn't care" how Justin feels about his music and has zero doubts about his ability to bite back.

"Eminem really doesn‘t care how Bieber feels about his flow and laughed when he saw what Justin wrote about him online," the source said. "Em is not crazy about Justin‘s music, it ain’t for him, so he doesn‘t care how he feels about him or who he disses."

They continued: "Em has also dissed Justin in the past and will probably make fun of him again. He is not too mad or scared of Justin and not worried about some war or feud with him. Eminem can take it as well as he can dish it, so it is all good."

At this stage, the Lose Yourself rapper has to pick his battles - as he's spread himself out on so many battlefields!

Perhaps one of his most infamous fights is with Machine Gun Kelly, who Eminem has been in a war of words with since Kelly made some pretty NSFW comments about his daughter.

Will the Slim Shady shade-throwing ever end? The clue is in the name.

If people in the music industry have learned one thing across the decades, it's to not mess with Eminem.

Over the years, we've seen many a musician come up against the rapper and get burned - this includes Mariah Carey, Limp Bizkit, and Will Smith. But it appears that some still haven't got the message and are lining up to take on the infamous sharp-tongued Slim.

This week, none other than Justin Bieber stepped up and took a shot. Sharing a screenshot to his Instagram story that showed he was listening to Eminem's 2018 song The Ringer, Justin claimed the 46-year-old star "doesn't understand" new rappers.

"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," he wrote.

The Love Yourself singer was starting up what could turn out to be a fabulous celebrity feud - but don't get your hopes up, as the whole thing allegedly just made Eminem giggle.

Speaking to HollywoodLife, a source has claimed that Slim Shady "doesn't care" how Justin feels about his music and has zero doubts about his ability to bite back.

"Eminem really doesn‘t care how Bieber feels about his flow and laughed when he saw what Justin wrote about him online," the source said. "Em is not crazy about Justin‘s music, it ain’t for him, so he doesn‘t care how he feels about him or who he disses."

They continued: "Em has also dissed Justin in the past and will probably make fun of him again. He is not too mad or scared of Justin and not worried about some war or feud with him. Eminem can take it as well as he can dish it, so it is all good."

At this stage, the Lose Yourself rapper has to pick his battles - as he's spread himself out on so many battlefields!

Perhaps one of his most infamous fights is with Machine Gun Kelly, who Eminem has been in a war of words with since Kelly made some pretty NSFW comments about his daughter.

Will the Slim Shady shade-throwing ever end? The clue is in the name.