Mariah Carey just learned of Katy Perry's Origin space flight

She doesn’t know her.

Mariah Carey isn’t keeping up with the news around Katy Perry.

Four months after the “Teenage Dream” singer, 40, went to space on the Blue Origin flight in April, Carey, 56, is apparently just learning about it.

During an interview on “The Scott Mills Breakfast Show” on BBC’s Radio 2, Mills asked the “We Belong Together” singer if she would also go to space like Perry.

Carey seemed confused, and replied, “Did she go to space?”

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When the host assured her that Perry did indeed do that, Carey repeated, with apparent disbelief and confusion, “Where’d she go?”

Mills seemed confused and said, “Space?”

“Into orbit and back? She’s, like, floating?” the “All I Want For Christmas Is You”