Rebecca Rubin Film and Media ReporterAfter three weeks atop domestic box office charts, “The Batman” will face competition from a nearly endangered Hollywood species: movie stars.At a time when familiar franchises, not big-name talent, have been dictating commercial success, Paramount is banking on the combined wattage of Sandra Bullock and Channing Tatum to lure audiences to “The Lost City,” a screwball romantic comedy that opens in theaters this weekend and harkens back to a genre that has mostly fallen out of favor with moviegoers.Buoyed by strong reviews and A-list actors, including a cameo from Brad Pitt and villainous turn from Daniel Radcliffe, “The Lost City” is expected to earn a promising $20 million in its opening weekend. Those ticket sales would put the film in an extremely close race against “The Batman” for first place.