Jon Hamm is hot — literally. The “Mad Men” star showed up for the Broadway show “Peter and the Starcatcher” this week in “a leather jacket and jeans despite 90-degree weather,” a spy said. Hamm was so taken with the performance of Matthew Saldivar, who just took over the role of Black Stache from Christian Borle, that he was “wiping away tears during the show’s ending.” Hamm then headed backstage with his main squeeze Jennifer Westfeldt to congratulate Saldivar on his debut.