Your child only turns 1 once, so it makes sense to make it memorable. Christina Aguilera pulled out all the stops for her son Max’s first birthday on Saturday, having a party based on the book Where the Wild Things Are. Among the 40 guests at Christina and husband Jordan Bratman’s Beverly Hills backyard fete were Nicole Richie and Joel Madden, whose daughter, Harlow, celebrated her big first birthday just the day before. Costumed characters from the book entertained the tots while treats like mini peanut butter and jelly sandwiches were enjoyed by the guests. Happy Birthday, Max!