The pair already share two children together- a boy born in 2017 and a daughter born in 2020.
He has three daughters with his ex-wife Lisa Stelly- Pearl, 10, Andy, 6, and Minnie, 4.
"Frederick Michael Dillard is here! He was born 7/7/2022," she wrote.
While talking of fatherhood and his involvement in the lives of his children, he admitted to New York Times that he doesn’t play a prominent role in his kids’ lives when they’re young.
She had announced her pregnancy in late January and followed by a picture of herself cradling the baby bump in February.
She is named Exa Dark Sideræl Musk but is nicknamed Y.
No biography was found.