When appearing on the show as a guest, the model showcased one of her party skills - opening a beer bottle with her teeth.
Well, JB certainly LOVED that, because it's the reason why he got back in contact with his ex.
Hailey revealed this when she appeared on the same show recently.
"There's actually another funny story behind this and that is last time I was here, we did this little party trick where I opened a Corona bottle with my teeth. And the next morning, after the interview had aired, I got a certain phone call from a certain someone," Hailey revealed.
"It was a little like, 'Hey, how are you? I saw you on Jimmy Fallon last night. You were looking really good. I loved that trick that you did. I had no idea that you can do that. It was so cool.' Cut to I'm now married to that certain someone," she said. "So I feel like Jimmy gets a little credit for helping re-spark romance."
Hailey discussed how met Justin in 2009, thanks to her dad.
"I know. Sounds like this weird arranged-marriage situation. We met because my dad, he brought me to the Today show when Justin performed there. He was no more than 15, I think. To be honest — this is the truth — he was so new that I didn't really know a lot about him yet."
Hailey's dad and Justin's mum became friends quickly, so they all went out the next day bowling.
"That's me, yeah. And what's funny is that in this photo, I'm super awkward. I had braces. Like, nowhere was there a thought that I was like, 'Yeah, he probably has a crush on me,'" she said.
Funny how the universe works!