Daughter Poppy James Gavigan joins older siblings Luke Hudson, 4, and Eve Augusta, 20 months. "Our hearts are bursting with love and gratitude upon the arrival of our baby girl," Capshaw, 35, and husband Christopher Gavigan told the magazine.
Capshaw and her husband, who co-founded The Honesty Company, have been married in 2004.
Although her character, Arizona, was involved in a disastrous plane crash that took the life of fellow Seattle Grace doc Lexie Grey (Chyler Leigh) in last season's finale, Capshaw will be back for Grey's ninth season.
Related Articles on TVGuide.com