Seoul, South Korea - BTS were joined by Anderson .Paak in an unforgettable live performance of a fan favorite.

On Monday, BTS presented a live-streamed music performance to celebrate the recent release of Proof, the band's new anthology album.

The 25-minute special showed the band performing various tracks from the record on a desert-themed set.

About four minutes into the set, BTS played the song Yet to Come (The Most Beautiful Moment), and was joined by artist Anderson .Paak, who jumped in on drums.

Celebrities Have Halle Bailey and rapper DDG called it quits?

After the song, the K-pop superstars spoke a bit with Paak, who was grinning ear to ear.

"I love it," he said, speaking about Yet To Come. "It reminds me of church." He went on to describe it as "amazing" in Korean, which the group seemed to appreciate.

Paak also explained how he became a diehard fan of the group after his son introduced him to their music.

"I’ve been obsessed, I’ve been ARMY ever since."

Proof, an anthology record, is currently out and streaming everywhere.