Lady Gaga flashes back to 'funny' time when she was a set extra

Lady Gaga just revealed she used to be an extra on set!

Before rising to stardom and becoming an award-winning singer as well as actress, the pop icon pointed out how she was an extra in the iconic heavy metal band, AC/DC music video.

The Born This Way crooner explained how she was in the background of the 2000 song, Stiff Upper Lip during her appearance on A Carpool Karaoke Christmas by Apple TV.

As the Apple Music host, Zane Lowe was shown a video by Gaga, of her late grandmother singing AC/DC's 1979 hit Highway to Hell, he then, surprised the Bad Romance hitmaker by inviting the bands lead vocalist, Brian Johnson.

"I brought you Brian Johnson for Christmas," Lowe told Gaga as the Black Ice album-maker climbed into the car.

"You want to hear something funny? I was in the Stiff Upper Lip video," she told Johnson, adding, "I was 17 and I was an extra in the back and I was headbanging."

"And they were like, 'Don't headbang. We want it to be modern.' And I was like, 'No, I can't. Like, there's only one move that I can do,'" the Poker Face singer recalled hilariously.

It is also pertinent to mention that Lady Gaga performed her rendition of Led Zeppelin’s iconic 1971 song, Black Dog on the show too.