“Can we discuss the lack of abs in this movie?” groused a female guest to pals after the Cinema Society premiere of “The Lucky One” Thursday, indicating it didn’t have enough of Zac Efron topless for her. “He kept his T-shirt on the whole time.” (The movie is PG-13, ladies!) She must’ve been crushed to see Efron at the after-party at Jimmy in a gray suit. The Men’s Health-sponsored bash drew Blythe Danner, Natasha Bedingfield, Doutzen Kroes and Erin Heatherton.