Stella McCartney Welcomes Her Third Child
01/10/2008 AT 04:05 PM EST
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