The duo also teamed up to sing “Highway to Hell.”

Christmas came a few days early forLady Gaga, who just met a fellow music legend.

Seconds later, who should appear by the driver’s seat butAC/DCfrontman,Brian Johnson.

Lady Gaga attends the Los Angeles Premiere of Warner Bros. Pictures “Joker: Folie a Deux” at TCL Chinese Theatre on September 30, 2024 in Hollywood, California., Brian Johnson of AC/DC performs at RCF Arena on May 25, 2024 in Reggio nell’Emilia, Italy.

Lady Gaga and Brian Johnson.Monica Schipper/Getty; Sergione Infuso/Corbis via Getty

“Hello, my darling, Johnson greeted, earning shocked laughter from Gaga.

My little Lady Gaga.

“You brought me Brian Johnson?

Lady Gaga in “A Carpool Karaoke Christmas”

Lady Gaga in “A Carpool Karaoke Christmas”.Apple TV+

The musicians then shared a hug before Johnson took the wheel of the Range Rover.

“You guys ready to rock?”

Lowe asked, to which Gaga replied, “This isthemoment.”

From there, Johnson and Gaga began a duet of the AC/DC hit, Highway to Hell.”

Im using my secret weapon, Johnson assured her.

Were all gonna die,” Gaga answered, shielding her eyes.

The surprises didn’t stop there.

After their duet, Gaga dropped a nugget of info that was clearly a revelation to Johnson.

You wanna hear something funny?

Johnson, shocked, replied, No you werent!

Apple TV+

I was 17, and I was an extra in the back," Gaga explained.

“I was headbanging and they were like, ‘Hmmm.

Dont head bang, we want it to be modern.’

And I was like, ‘No, theres only one move that I can do.'”