From the summer of 1941, in Beverly Hills, when she was a teenage heiress being courted by Howard Hughes, to her one-night stand with Marlon Brando, to her explosive New York fling with Frank Sinatra, GLORIA VANDERBILT has romantic memories of some of the 20th century's most celebrated men. In an excerpt from her new book, It Seemed Important at the Time, she chronicles dazzling meetings, passionate mistakes, and lasting love