The guys' diss all went down when Luke said, "Last year, when you heard Merle Haggard singing a song about being drunk, out of work and in jail, it sounded like Merle was signing about his younger self..." Blake replied, "This year, it sounds like he's singing about Justin Bieber."
Ohhh, no he didn't! Unleash the wrath of the Beliebers...After the Bieber joke, Luke poked fun of Miley and country singer Jake Owen, who had to have his finger amputated after an accident last summer.
"Jake lost a finger in a go-cart accident," Luke said. "You know where they found it? On Miley Cyrus' tour bus. It was takin' a selfie and smokin' a doobie."
Hopefully everyone had a good sense of humor about the jokes. We thought they were pretty freakin' hilarious. And let's be real, who doesn't make fun of the Biebs and Miley these days?
See what everyone wore to the awards show in the gallery below. Find out who the night's big winners were here.
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Gallery | ACM Awards Red Carpet Arrivals: Best & Worst Dressed