Pedro Pascal and Vanessa Kirby, whose recent flirtatious behavior towards one another has raised eyebrows, are just two of Hollywood's mega-stars who have sparked romance rumors from handsy, red-carpet appearances. From gentle neck rubs to hand-holding, the superhero power couple — who play Reed Richards/Mr. Fantastic and Sue Storm/The Invisible Woman in the Marvel film, "The Fantastic Four: First Steps" — have been noticeably touchy with one another while promoting the movie. But Pascal, who recently admitted physical touch helps him cope with anxieties, said there's nothing more to it.SCARLETT JOHANSSON DEFENDS VIRAL RED CARPET KISSES WITH CO-STAR JONATHAN BAILEY"I was always