A very pregnant Jennifer Love Hewitt recently had baby practice with her 3-month-old niece, “changing quite a bit of diapers.” “It’s more difficult than people think it is when they’re squirming around and you’re trying to get everything clean,” she told us at a Pampers event at Grand Central. “I haven’t changed a really bad diaper yet. We’ll see what happens.” The actress, who’s reportedly due in November, says she and her fiancé and “Client List” co-star Brian Hallisay are just “enjoying each other before becoming parents,” and, “We could have a couple of kids,” adding, “We’ll get this one out first.”