Machine Gun Kelly is known for living a wild lifestyle. He causes a ruckus at his concerts, has had an on-and-off relationship with a porn star and takes joy rides on tour buses. He's already managed to live a full life as he turns 25 today (April 22).

Named after the famed criminal George "Machine Gun Kelly" Barnes, MGK initially caught attention because of his high-speed lyrical performances. In 2009, the Cleveland-bred talent became the first white rapper to win at Apollo Theater's Amateur Night. MGK pushed the hype with his series of mixtapes -- most notably 2010's 100 Words and Running and Lace Up! -- and finally caught Diddy's ear at 2011's SXSW. He would go on to sign with Bad Boy soon after.

MGK's biggest push for ubiquity happened in 2012, when XXL tapped him to grace its annual Freshman cover. "Wild Boy," a career thesis featuring Waka Flocka Flame, became MGK's lone entry on the Billboard Hot 100 at No. 98. Many knew about "Invincible" thanks to that HTC commercial, but even that didn't make much of a dent on the charts. Regardless, MGK finally released his debut album, Lace Up! to a lukewarm response in 2012.

But perhaps MGK's id-driven tendencies are more exciting in live performances than studio recordings. A look over on YouTube features many shows that showcase his stage dives and altercations. And of course, there was that NSFW run-in with Rachel Starr.

MGK is still doing his thing these days. He's working on his second album while continuously brining his rambunctiousness on tour.

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