Machine Gun Kelly has recounted how he once stabbed himself in front of girlfriend Megan Fox in an attempt to impress her

The eccentric 31-year-old musician made the bonkers admission while appearing as a guest on NBC’s The Tonight Show hosted by Jimmy Fallon.

Explaining that he had been gifted the blade by a friend moments before the incident happened, he said: “I threw it up and it stuck in my hand.

“You know how you throw it up and you’re supposed to catch it. I looked at her and I was like, ‘check this out’.”

Adding: “I was like, ‘Yo, I need stitches real quick.’”

He even showed off a scar on his hand to the stunned-looking host who confirmed he could see it.

MKG - real name Colson Baker - and the Transformers actress, 35, have been dating since last year.