Jennifer Garner and Ben Affleck's three-month-old daughter Seraphina "is the most beautiful baby," Greg Grunberg told Usmagazine.com at the 20th annual GLAAD Awards in L.A. Friday. "Those two know how to make kids, I'll tell you that right now," joked Grunberg, who costarred with Garner on AliasSo what makes the couple -- who also have daughter, Violet, 3 -- such great parents? "I think, just like anybody else, they are very attentive