Fergie’s hubby, Josh Duhamel, is excited for the birth of their son, but admits he’s anxious. “I am definitely nervous, especially for a first-time father,” he told us while launching the Valspar Hearts & Hands for Habitat initiative last week. “I can’t wait to meet the little dude. It’s gonna change everything . . . Being a dad is the most important thing in the world.” While Fergie’s due date is fast approaching, the “Scenic Route” actor said they’re still getting ready. “We’re doing the baby room as we speak . . . We started with blue, and then we got green and browns. It’s earthy, but industrial,” he said. The pregnant singer recently legally changed her name from Stacy Ann Ferguson to Fergie Duhamel. “I call her hot buns,” Josh joked of the change, but added, “I’m flattered, I think it’s very sweet.”