Watch: Lady Gaga Confirms a 'Telephone' Sequel is Happening... But Who Knows When?

Lady Gaga underwent a lie detector test and answered the question fans have been asking for 16 years... sort of.

Sitting down for one of Vanity Fair's celebrity lie detector tests, Mother Monster declared – truthfully, evidently – that she was a bundle of nerves. But when she said she lacks a convincing poker face, the machine called her out.

That was just the calibration stage of the proceedings. Once the machine was ready, the technician – named Stephanie, much like Lady Gaga herself, whose real name is Stefani Joanne Angelina Germanotta – jumped right in with the most important question of all: Will there be a sequel to the 2009 Gaga/Beyoncé collab "Telephone," the video for which was a more than slightly Sapphic grindhouse thriller with a cliffhanger ending?

"Yes," the "Bad Romance" singer replied.

"When?"

"I don't know," Mother Monster answered, though she went on to tease with a smile that Beyoncé will "maybe" be in the followup.

"You're being truthful," Stephanie the technician confirmed.

But Gaga had bigger concerns: "I can't keep the picture of Beyoncé?" she asked. "Okay."

Gaga went on to say that the long wait for a followup is not the result of her and Beyoncé being unable to fit it into their busy schedules, though no alternative explanation was offered.

Speculation and teasing hints around a "Telephone" followup have swirled for years. A year ago, sharp-eyed fans were convinced they had spotted clues signaling a sequel was imminent, and theories abounded that a Part 2 would appear on Beyoncé's album "Cowboy Carter."

That didn't happen, though Beyoncé did pick up some Grammys this year for "Cowboy Carter," which won Album of the Year.

Not long afterward fans went berserk with those theories, Gaga said she would be up for such a project, quipping, "Whenever Beyoncé calls, I'd like to pick up the phone." As of yet, though, nothing concrete has been announced.

As the lie detector test continued, Gaga cleared up a mystery about the lyrics to "Just Dance" and gave her thoughts about being on a "Real Housewives" reality show, her collab with Kermit the Frog, and the rumor that she once wanted to deliver a performance from within the confines of a vending machine.

"I wanted to perform inside the vending machine?" Gaga replied to the latter. "That sounds like I might have said that. I believe that I might have said that. I don't remember, though."

Watch Lady Gaga's lie detector test below.