Old Hollywood and Older Hollywood gathered Saturday in New York to witness Liza Minnelli’s becoming a bride for the fourth time. Outside Fifth Avenue’s Marble Collegiate Church, press photos show, the bride, 56, arrived swathed in a white mink coat, in an outfit designed by Bob Mackie, and on the arm of her groom, producer David Gest, 48. Inside, according to the Associated Press, best man Michael Jackson carried the train of her white silk gown until maid of honor Marisa Berenson (Minnelli’s “Cabaret” costar) remembered that carrying the train was her job. Jackson showed up with co-maid of honor Elizabeth Taylor, who, like most of the guests who followed the event’s dress code, was a vision in black. The reception was held at the Regent Wall Street Hotel, near Ground Zero. Among the 800 guests, according to worldwide news reports: Elton John, Mickey Rooney, Phyllis Diller, Kirk Douglas, Michael Douglas, Robert Wagner, Diana Ross, Mia Farrow, Esther Williams, Gina Lollobrigida, Gale Storm, Anne Jeffries, Anthony Hopkins, Donny Osmond, David Hasselhoff, Joan Collins, Carol Channing, Andy Williams, Lauren Bacall, Martha Stewart and Donald Trump. Gest and Minnelli sold the story rights to their wedding to Britain’s OK! Magazine (reportedly for $400,000). The publication quotes Gest as saying that he and Minnelli, who has suffered five miscarriages in the past, “are adopting four children . . . of all races, a black child, a white child . . . Liza is going to be the best mother in the world.” Minnelli’s mother was the troubled singing legend Judy Garland; her father, noted MGM film director Vincente Minnelli. She was previously wed to entertainer Peter Allen (1967-72), producer Jack Haley Jr. (1974-79) and stage manager-sculptor Mark Gero (1979-92). This is Gest’s first marriage.