They scooped the award for Best Pop Duo / Group Performance with 'Stressed Out', ahead of the likes of The Chainsmokers & Halsey, Rihanna & Drake, Sia & Sean Paul and Lukas Graham.
Tyler and Josh also collected the award in their underwear. Why? Well...
"This story starts in Columbus, Ohio. It was a few years ago and it was before Josh and I were able to make money playing music," explained Tyler.
"I called him up and I said, 'Hey Josh, do you wanna come over to my rental house and watch the Grammys? There's a couple of my roommates, just come and watch the Grammys with us.
"As we were watching, we noticed that every single one of us was in our underwear, and seriously Josh turned to me - and we were no one at that time - he turned to me and said, "If we ever go to the Grammys, if we ever win a Grammy, we should receive it just like this."