They are both legends in their own right.
But a Mariah Carey fan was shocked when she requested a birthday cake with the diva’s face on – only to get a Marie Curie-themed surprise instead.
Birthday girl Siobhan had told her colleagues she would love a cake adorned with a snap of the Fantasy singer for her big day.
But her workmates misunderstood and instead delivered a cake celebrating Marie – the first woman to win a Nobel Prize for her research into radioactivity.
The delicious mix-up was revealed after Siobhan’s cousin shared a picture of the cake, which used a black and white portrait of Marie looking rather serious.
Author Harriet Lye posted on Twitter: “My cousin in England told her colleagues she wanted a Mariah Carey birthday cake.
“They misunderstood, and is the cake they made her instead. It’s Marie Curie, looking very festive.”
“Both smart Queens,” one wrote.
Many agreed that the Marie Curie cake was actually a much better result – but some jokingly warned the cake could be radioactive.
Harriet Alida write: “This is better. No shade to Mariah but come on.”
Another added: “Look, Mariah is a queen, a god, a skinny legend, there's no doubt about that.
“But Mme Curie is THE queen, THE god, THE skinny legend.”
Ashi Krishnan wrote: "Mmm! What flavour is this? Polonium."
One Twitter user said: “Them baby cupcakes deserves some Nobel prizes too.”
Another tweeted: “Pro: It glows in the dark.
“Con: Because of Radium, Cesium and Thorium exposure.”
One added: “Look, they spelled her name correctly, and as someone who's middle name is Siobhan I can attest to the number of times people have effed it up. This is amazing.”