Jenna Dewan-Tatum often seeks fashion advice from her “Magic Mike” husband, Channing Tatum, even though he seems to be more often without a shirt these days. “He started as a model, so he knows a lot about clothes. He’ll give me the ‘Yeah, babe, that’s good,’ or ‘No. Maybe you should try this,” she told us at the Marchesa show at Grand Central Terminal. But the actress confessed she nearly exposed herself by wearing a low-cut dress. “I had to make sure I sat with my shoulders back the entire time.”