Actress Kellie Martin has welcomed her first child, a baby girl. Margaret Heather Christian was born on Saturday at 12:21pm weighing 8lbs and 21 inches long. Kellie is best known for her starring role in the 90's tv hit series Life Goes On and is married to Keith Christian. Kellie, 31, has also starred in the hit drama ER. Martin's rep tells People "Kellie and Maggie are both are doing very well."