DIVA ALERT: Fresh from winning her fourth Grammy Award on Sunday, opera diva Renee Fleming took in Douglas Hannant's show Wednesday morning at the DiMenna Center for Classical Music in the far West Side. David Aladashvili, a pianist in the Masters program at Julliard School, tickled the ivories and models walked in jewel-colored outfits trimmed with leather and vividly dyed furs. "I'm going to a couple of shows," Fleming said. "This is my fun, happy week." Fleming has been wearing Douglas Hannant for a few years to big engagements. "Glamour is so much a part of what I do. The expectations the audience has... Designers typically love that they can go to town." Coming up for Fleming are three dates at Carnegie Hall, including "A Streetcar Names Desire."