Post Malone proved his traditional country bona fides during his Grand Ole Opry debut on Wednesday night (Aug. 14).

At the top of his show, he brought out two legendary performers from the genre – Vince Gill and John Michael Montgomery — for a pair of back-to-back classic country covers. During Gill’s appearance, he and Post duetted on his early-’90s hit “One More Last Chance.”

And when Montgomery took the stage, the pair performed a song that Post has been covering for quite a while.

That’s “Be My Baby Tonight,” a No. 1 country hit from 1994 that’s featured on Montgomery’s Kickin’ It Up album.

The two stars certainly kicked it up on the Grand Ole Opry stage: Before they launched into their performance, Montgomery even told Post that he was a fan.

“Welcome to Nashville, Post. Glad to have you hear, buddy. Yes, sir,” the older star said. “I have to say, I’m impressed with the videos I saw of you singing some of my songs. My daughter’s a huge fan, so she showed me these videos. So it’s nice to be invited here to sing along with you.”

Press play below to watch the pair’s performance of “Be My Baby Tonight,” which begins at around the :29 minute mark.

During his Opry set, Malone delivered rollicking performances of country classics, and also gave his audience a few never-before-heard previews of his upcoming F-1 Trillion album. Those included the live debut of his Lainey Wilson duet, “Nosedive,” with Wilson herself. Brad Paisley also made an in-person appearance, and the pair debuted “Goes Without Saying.”

One other F-1 Trillion track, “California Sober,” got its first-ever live performance at the Opry on Wednesday night. On the album, that song is a duet with Chris Stapleton. Stapleton wasn’t free to sing it at the Opry, though, and the War and Treaty stepped in as Posty’s duet partners for the performance.

F-1 Trillion arrives on Friday (Aug. 16).

Carena Liptak is an Associate Editor and staff writer at Taste of Country. She specializes in breaking country music news, interviews and lists. In particular, she’s got a soft spot for sad songs — check out her roundup of the 50 Saddest Country Songs of All Time!