Mick Jagger's representatives say the rock legend has welcomed the birth of his eighth child, the AP reports. Jagger, the 73-year-old frontman of the Rolling Stones, was on hand Thursday at a New York hospital when girlfriend, 29-year-old ballerina Melanie Hamrick, gave birth to the couple's son. According to a statement, both parents are "delighted" and "mother and baby are doing well." Jagger already has seven children who range in age from their 40s to teenagers. He is also a grandfather of two children and a great-grandfather of one, a little girl who's just about two and a half years older than her new great-uncle. (More Mick Jagger stories.)