Pete Davidson has joked he's switched Ariana Grande's birth control pills with mints.

Pete Davidson

Pete Davidson

The 24-year-old comedian still can't believe that he's engaged to the 'God Is A Woman' hitmaker because she's the "No.1 pop star in the world" and has quipped that he's so ready to start a family with her that he's replaced her contraceptive tablets with Tic Tacs.

Speaking on 'Saturday Night Live', he said: "I got engaged and no one could believe it. I can't believe it. I get it, she's the No. 1 pop star in the world and I'm that guy from 'SNL' that everyone thinks is in desperate need for new blood.

"Do you remember when that whole city pretended that kid was Batman because he was sick? That's what this feels like. Last night I switched her birth control with Tic Tacs. I believe in us and all, but I just want to make sure that she can't go anywhere."

Although he's certain that their relationship will last, Pete still wants a prenuptial agreement put in place when they tie the knot so that Ariana can't steal his trainers.

He joked: "Obviously I wanted one [a prenup], you know, so God forbid we split up and then she takes half my sneakers. No look, I'm totally comfortable being with a successful woman, I think it's dope. I live at her place."

The couple got together just weeks after the 25-year-old singer split from her boyfriend-of-two years Mac Miller - who tragically passed away earlier this month from a suspected drug overdose - and announced their engagement in June.

When asked when she knew Pete was "the one", Ariana said: "It's just, like, a feeling. I know that's so cheesy, people are always like, 'When you know, you know,' and you're like, 'Oh yeah. Whatever. OK.' I mean, he ticks every box and it gets better every day. And I'm very grateful. We're gonna take our time to plan [the wedding]. My friends and I, my mom [Joan] and everybody have been brainstorming and sharing ideas and stuff. It's really fun. I work so much. I've never spent this much time or energy planning something personal that feeds my soul so much, and my heart. I'm gonna cry, I'm just so excited. It's sick, it's really fun. But it's not soon soon, it's gonna be like ... next year."