MAMMA MIA: Mother’s Day came early this year to the DVF studio in New York, where a stylish set gathered to support the White Ribbon Alliance for Safe Motherhood and take a peek at Christy Turlington Burns’ documentary, “No Woman No Cry.” Diane von Furstenberg designed a T-shirt for the cause with “love is life” spelled out in white ribbons, which will be sold for $145 at DVF stores and on its Web site. “Maternal mortality is so tragic because of the hundreds of thousands of deaths every year, 90 percent are preventable,” lamented Burns, looking angelic in a white Zero + Maria Cornejo dress. The mood lifted when conversation turned to Mother’s Day gifts. “I always ask for breakfast in bed. And cuddling, that’s the best,” said Maria Cornejo, who had just returned from jurying the Hyères Festival in France. Tory Burch greeted expectant mother Georgina Chapman, who at 24 weeks was considering her options for maternity wear. “I’ve been changing all my dresses, adding elastic and things like that. I wouldn’t mind doing maternity wear, having gone through this,” she said. Von Furstenberg reminisced about her mother, a Holocaust survivor. “The doctor told her she absolutely could not have a child yet but, before you know it, I was born. So my birth was very much a miracle. Every birth is really a miracle,” she said.