Comic Jerry Seinfeld, 45, has popped the question to his girlfriend, Jessica Sklar, 28, a public relations executive for Tommy Hilfiger. Their romance has played like a script for his long-running sitcom: Recently married girl returns from honeymoon, meets TV's most eligible bachelor at the gym, and dumps hubby for same. Seinfeld has never been married; Sklar is divorced from Broadway producer Eric Nederlander. No word on when the nuptials will take place. "We're both very happy," the bride-to-be told the New York Post.