Stella McCartney Welcomes Her Third Child

By Stephen M. Silverman

Thursday January 10, 2008 04:05 PM EST

Stella McCartney

Ronald Asadorian/Splash News

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Fashion designer Stella McCartney, 36, has given birth to her third child, a son, Beckett Robert Lee, PEOPLE has confirmed.

Born Tuesday in London, Beckett joins brother Miller Alasdhair James, born in February 2005, and Bailey Linda Olwyn, born in December 2006.

Dad is McCartney's husband, Alasdhair Willis, the chairman of a furniture company, and grandpa is Paul McCartney. Stella's mother, Linda McCartney, died of breast cancer in 1998.

Vogue.com first reported Beckett's arrival.

• Reporting by SIMON PERRY