Liv Tyler has a new baby, and that means Aerosmith singer Steven Tyler is a granddaddy — again. On July 10, the 39-year-old actress posted an Instagram of her newborn daughter, Lula Rose Gardner. “Our beautiful baby girl is here,’’ she wrote, along with many heart emoticons. “We are sooooo happy... heart exploding with love !!!!!’’ The Associated Press reported that this is Liv’s third child (she has two sons: 11-year-old Milo and 17-month-old Sailor) and her second with partnerDavid Gardner.