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Fans of the Material Girl are in an uproar on social media after a performance that made people second guess the authenticity of her derriere.

During Madonna’s twerktastic Art Basel show in Miami, the singer was shaking her stuff. There’s only one problem, her stuff wasn’t shaking.

Related: Twitter wasn’t impressed with Madonna’s Prince tribute

The 58-year-old icon shared the stage with pop star Ariana Grande, 23. They performed Madge’s hit “Music” while the twosome appeared to be having a twerk-off.

The only problem was the rather large backlash on social media. People were criticizing both Madonna’s twerking as well as her awkward looking backside.