Academy of Country Music Awards co-hosts Luke Bryan and Dierks Bentley stopped by to chat with ET before Sunday's big show and they dished on some of the biggest stars expected to appear.

Bryan has co-hosted country music's biggest night since 2013, but this year he's recruited Bentley to fill the slot left vacant by Blake Shelton. Bryan had a lot to say about his former co-host and his pal's new flame Gwen Stefani.

WATCH: Dierks Bentley Replaces Blake Shelton as Luke Bryan's ACM Awards Co-Host

"I think when you date Blake Shelton ... I just hope it's not affecting her IQ," joked Bryan, who claimed that he doesn't know if Stefani will attend the show over the weekend. "Maybe she's got a good support group around her to keep the positive influences of Blake versus the negative."

Shelton began dating Stefani shortly after calling it quits with country star Miranda Lambert last summer. Shelton and Lambert are expected to give separate performances at the ACM Awards and Bryan couldn't hide his astonishment at all the
accomplishments the country queen has achieved.

"I don't think anybody's won more ACM awards in history than Miranda," Bryan said. "I think Miranda is Miranda, because she brings so much energy."

WATCH: Video Evidence That Dierks Bentley Is Just the Best

For the past six years, Lambert has walked away with Female Vocalist of the Year, and on Sunday, she'll have a chance at her seventh trophy in the category.

Find out what happens when the 51st annual ACM Awards return to Las Vegas on Sunday, April 3, at the MGM Grand Garden Arena, airing live on CBS at 8 p.m. ET/PT.