In the short Instagram clip, the singer tries to imitate Boomerang's infinite loop by turning her head from side to side.

The focus is supposed to be on her yellow eyeliner and the tube in her hand, which will be on sale during Black Friday.

But attentive fans quickly noticed the video wasn't actually a Boomerang. The repeated movements did not match, and even more telling: the video was missing the Boomerang symbol in the upper corner.

Cardi B Cardi B gives rare peek at baby girl four months after birth: "Soooo big"

One fan wrote on Twitter, "i love her but that was such a fail."

Another joked, "Someone said she put the BOOMER in Boomerang & I’ve been screaming ever since."

Other fans are coming out in defense of Lady Gaga.

"This is literally a commentary on how social media can be fake, she is such a genius human, just by recreating the same pose she is showing that humans tend to perform on online to look perfect," one user wrote.

Others suggested the fake Boomerang was a PR ploy to get more attention.

Sabrina Carpenter Harry Jowsey slid into Sabrina Carpenter's DMs after her breakup – but did she respond?

"Clearly a good marketing strategy," one fan commented.

Another added, "great marketing, i’ve seen this post so many times, literally free ads."

The singer has not yet responded to the comments, and the Instagram Story has since disappeared from her page.