Eminem insists his beef with Machine Gun Kelly isn't about him calling his daughter Hailie ''hot as f**k'' in 2012.

The 'Lose Yourself' rapper has teased that his problem with the 28-year-old star is ''a lot more petty'' than anything he's ever said about the 22-year-old beauty on Twitter, after he hit back with the diss track 'Not Alike' on his surprise record 'Kamikaze' last month.

In the first part of a YouTube interview with musician Sway, Eminem - real name Marshall Mathers III - explained: ''You know you go down the wormhole of YouTube and whatever, right?

''So I see, 'Machine Gun Kelly talks about Eminem's daughter' or whatever, right? So I'm like, 'What the f***?' I clicked on it. Then he starts doing a press run, basically, about Hailie. I'm like, 'What the f***? Yo, my man better chill.'

''So, that's not why I dissed him. The reason I dissed him is actually a lot more petty than that. Now I'm in this f***in' weird thing, because I'm like, 'I've got to answer this motherf***er.'''

On the song, Eminem raps: ''Now you wanna come and f**k with me, huh? / This little c**k-sucker, he must be feeling himself / He wants to keep up his tough demeanour, so he does a feature / Decided to team up with Nina / But next time you don't gotta use Tech N9ne if you wanna come at me with a sub-machine gun/And I'm talking to you but you already know who the f**k you are, Kelly/I don't use sublims and sure as f**k don't sneak-diss/But keep commenting on my daughter Hailie.''

Eminem is already back in the studio after MGK released his diss track 'Rap Devil' in response to 'Not Alike'.

Kelly - whose real name is Richard Baker - admitted his rap battle with the hip-hop legend is a ''battle between the past and the future''.

He said: ''This is not a battle between Michigan and Ohio. This is a battle between the past and the f***ing future.''

Part two of the Sway interview, with the full explanation on their feud, is set to follow.