Sharon Stone (search) has adopted a baby boy.

The baby was born to "unknown and unrelated parents in Texas" on Saturday, Stone's publicist, Cindi Berger, said in a statement Wednesday.

Stone, 47, has named the baby Laird Vonne Stone (search). The actress has a 4-year-old son, Roan. She and her husband, Phil Bronstein (search), divorced in 2004 after five years of marriage.

"Mommy and her boys are over the moon," the statement said.

Stone, best known for her role in 1992's "Basic Instinct," was nominated for a best-actress Oscar for her work in "Casino." Her screen credits also include "The Quick and the Dead."

She is in London filming "Basic Instinct 2: Risk Addiction," directed by Michael Caton-Jones.