Bump Watch: Stella McCartney Spotted with Baby Number 4 on Board

stella mccartney
Stella McCartney is pregnant with her fourth child

Celebrated fashionista Stella McCartney, who turned 39 yesterday, keeps her baby bump under wraps as she and husband Alasdhair Willis did a school run in London on her birthday. The designer daughter of Sir Paul McCartney and his late wife Linda is expecting her fourth child in the winter. McCartney, who is close pals with fellow mom Gwyneth Paltrow, is mom to two boys and a girl: Miller Alasdhair James Willis, 5; Bailey Linda Olwyn Willis,  3-1/2; and Beckett Robert Lee Willis, 2-1/2. Another photo of McCartney and her husband next.

Photos: Pacific Coast News