Stella McCartney's husband

Stella McCartney and husband Alasdhair Willis arrive at the Metropolitan Museum of Art Costume Institute gala benefit, celebrating the 'Alexander McQueen: Savage Beauty' exhibition, Monday, May 2, 2011 in New York. (AP

Photos from Fashion Designer Timeline: Past to Present

Stella McCartneyat Wimbledon with husband Alasdhair Willis

Stella McCartney puts on a stylish display in a white shirt and linen shorts as she explores Venice with her husband Alasdhair Willis

496 Stella Mccartney Husband Stock Photos, High-Res Pictures, and Images - Getty Images

Stella McCartney and Alasdhair Willis Welcome Fourth Child - CBS News

513 Stella Mccartney Husband Stock Photos, High-Res Pictures, and Images - Getty Images

A Stylish Pair: Louise and Jamie Redknapp at Stella McCartney Christmas Lights Switch-On

Stella McCartney Alasdhair Willis on private schools row, British Vogue

Oprah supports Stella McCartney at Paris Fashion Week for a charitable cause

Stella mccartney and husband alasdhair willis hi-res stock photography and images - Alamy

Stella McCartney and husband Alasdhair Willis on the school run in London Featuring: Stella McCartney,Alasdhair Willis,Reiley Willis Where: London, United Kingdom When: 30 Apr 2013 Stock Photo - Alamy