Jennifer Lopez and Marc Anthony celebrated their 1-year-old twins Max and Emme with a Birthday party at their Bel Air home on Saturday. About 50 guests, including Nicole Ritchie, Joel Madden and their Daughter harlow, 1, joined the casual afternoon party, which started at about 1 p.m.Several guests were seen arriving with gifts in Elmo and Disney bags. Others brought stuffed animals and "Happy Birthday" balloons in festive shapes and