Stella McCartney welcomes a baby girl!

Fashion designer Stella McCartney has given birth to a daughter, Bailey Linda Olwyn Willis, PEOPLE has confirmed.

The baby, born on Dec. 8 in London, weighed 7 lbs., 14 oz.

This is the second child for McCartney, 35, and her husband of three years, former magazine publisher Alasdhair Willis, 36. They have one son, Miller, who turns 2 on Feb. 25.

Source