That handsome man walking into the Loeb Drama Center to see Eve Ensler’s new show, “In the Body of the World,” was the playwright’s son, of course. Dylan McDermott and his fiancee, actress Maggie Q, (inset) did not go unnoticed in the audience at the American Repertory Theater. Directed by ART artistic director Diane Paulus, the show is based on Ensler’s 2013 memoir of the same name. We’re told McDermott, who is best known for his role on “The Practice,” took his mom to dinner at Toscano after the show.