Machine Gun Kelly and Megan Fox have marked a year since they first said "I love you".

Machine Gun Kelly and Megan Fox (c) Instagram

Machine Gun Kelly and Megan Fox (c) Instagram

The couple celebrated a major milestone in their relationship on Tuesday (25.05.21) and Kelly took to Twitter to acknowledge the day with his millions of followers.

In the sweet post, he wrote: "she said ‘i love you' one year ago today (sic)"

It comes after Kelly revealed that Megan gave him a vial of her blood on a necklace so that he wouldn’t miss her when she went out of the country for a film role.

He said: "Well, she was actually going out of town to film a movie.

"This was really new in our relationship. I didn’t have a passport either. So, she was going out to Bulgaria so I was kind of freaking out, like, ‘You’re gonna leave and I can’t even come see you.' Some people give, like, a handkerchief to their partner or whatever. She gave me her DNA."

The loved-up pair started dating last year and Kelly previously confessed he "didn't know what love was" until he met Megan.

He said: "I didn’t know what [love] was until me and her made eye contact. That’s when I was like, ‘Whoa.’ After I made the big chunk of the album ['Tickets to My Downfall'], I did fall in love for the first time. That was my first experience with being open to love and stuff like that.

"I definitely wasn’t set up to believe that that’s something that could ever exist. My house isn't gated, so that's the one problem. Everyone knows where my house is, so it's like this odd moment, where I was kind of living my life super normal and the next day, there were paparazzi outside my house every day."