Impressing your crush is never easy... just ask Machine Gun Kelly.

In fact, the rocker, 31, once actually stabbed himself with a knife in a desperate bid to look cool for Megan Fox.

The pair, who first met on the set of their film Midnight in the Switchgrass, have been dating since May 2020, and went public with their relationship with their November later that year.

Appearing on the Tonight Show Starring Jimmy Fallon, MGK chatted to the talk show host about his girlfriend Fox while wearing a T-shirt with her face emblazoned on it.

Watch MGK open up about the bizarre ordeal below:

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Opening up about his coccyx injury, MGK soon turned the conversation to how he knifed himself whilst trying to look cool to Fox.

"I threw it up and it stuck in my hand," he explained, showing the scar to Fallon as proof of his ordeal. "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.'"

"I was like, 'yo, I need stitches real quick,'" he said of the following morning.

MGK - real name Colson Baker - has been very open about his relationship with actress Fox ever since they got together.

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Back in October, the pair opened up about their first kiss.

It when was the pair saw each other again on the set of Midnight in the Switchgrass that they knew it was fate.

"It was obvious from second one what it was going to be, but we didn't hook up right away," Fox said. They got emotional first, Kelly said: "She was just like, 'How are you feeling?' And I said, 'I'm lost.' She said, 'Well, let’s find you.' That was the first real conversation we had."

Initial text conversations became hours-long phone calls, and it's safe to say the pair couldn't go a day without talking to each other.

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Recalling their unconventional first kiss, MGK recalled: "Even our first kiss, she wouldn't kiss me.

"We just put our lips right in front of each other and breathed each other's breath and then she just left."

Their first real date was romantic, with Kelly driving Fox in a 1974 Cadillac convertible to a picnic at a canyon’s edge, where a blanket and roses were set up. The night ended with them driving to the Roxy Theatre, which was closed.

"We went to the roof and played pop-punk and made out," he said.

Featured image credit: REUTERS / Alamy

Machine Gun Kelly once stabbed himself with a knife trying to look cool for Megan Fox