“Newsroom” stars Kathleen “Kick” Kennedy and Thomas Matthews have struck up romance on the set of the Aaron Sorkin show. They were holding hands at Amanda Hearst’s Friends of Finn benefit at XVI Rooftop Thursday. “Kick was wearing a beguiling black dress and seemed very intimate with him,” a spy said. Her dad is Robert F. Kennedy Jr., and Matthews is the son of MSNBC’s Chris Matthews. Guests at the Star Vodka bash included Tony Danza and Madame Mayhem.