What do you bring to the world premiere of a standout ballet performance in New York City? If you're actress Fran Drescher, the only answer is your gay ex-husband, longtime television producer Peter Marc Jacobson.Drescher's first husband of 21 years was her date when People magazine caught up with the couple before principal dancer Tiler Peck took to the stage for George Balanchine’s ballet Diamonds at the Spring Gala on May 7.“He's my gay ex-hu…