Grimes made a shocking revelation during a cover story for Vanity Fair.

The singer revealed that she and partner Elon Musk welcomed their second child, a daughter, late last year.

The couple are also parents to 22-month-old son X Æ A-Xii.

For their baby girl, they call her Y.

The Canadian songwriter also shared that they had the baby via surrogate.

During the chat, Grimes shared that the pair wanted to have more children.

She said: “We’ve always wanted at least three or four.”

Grimes also revealed that she and Musk “live in separate houses.”

She calls the Tesla founder as her “boyfriend” and her “best friend.”