Paul McCartney and his wife Heather Mills are the proud parents of a baby girl, Beatrice Milly McCartney, born Tuesday at a London hospital. "She is a little beauty," the 61-year-old former Beatle said. "We couldn't be prouder." According to reports, Beatrice was born three weeks premature and delivered by Caesarean section. This is the couple's first child. McCartney has three adult children from his marriage to Linda McCartney, who died in 1998 of breast cancer.