“Hitchcock” actress Scarlett Johansson and her new boyfriend, French journalist Romain Dauriac, took in a weekend performance of the Alvin Ailey American Dance Theater at City Center. The new couple, whom Page Six first spotted dining at the Beatrice Inn a few weeks ago, were seen sitting in the center of the orchestra and chatting during intermission of Sunday night’s show. The lovebirds joined in the standing ovation and then dashed out through the backstage area.