Landscape designer Edwina von Gal threw a wedding celebration and baby shower for W editor Stefano Tonchi and his longtime partner, art gallery owner David Maupin, at her East Hampton home over the weekend, sources said. Chic Italian Tonchi and his partner are expecting twin girls, Maura and Isabella, via a surrogate in early August, sources added. Well-wishers at von Gal’s weathered modern house included Ingrid Sischy, Sandy Brant, Tory Burch, Lyor Cohen, Bottega Veneta designer Tom Maier, Chanel’s Rebekah McCabe and Alexander Vreeland. Tonchi and Maupin tied the knot in a ceremony in Massachusetts earlier this year. The fete also celebrated the couple’s union just after the passage of gay marriage in New York.