Mariah, 49, and Bryan, 36, have been living their best life at the Cannes Film Festival in France overseas.
She performed at an event held by jewelry maker Chopard on Friday, May 17.
The Grammy winner belted out several classic hits including "Touch My Body" and "Hero".
Mariah posted a photo of her cuddled up with Bryan on Instagram Saturday, May 18. The two wore rings by Chopard in the snap which made people think they got engaged!
"Thought this was an engagement photo for a spliiiit second," one wrote. "Showing off wedding rings low key in your face style," another one chimed in.
Do you think Mariah and Bryan will get married someday? Sound off in the comments!