Hilary Duff and Mike Comrie Credit: Steve Granitz/WireImage.com

Nearly a year after welcoming son Luca, hot mama Hilary Duff continues to keep her marriage of two years to Mike Comrie spicy. Among the 25-year-old singer's ways to strengthen their bond? Regular date nights!

"Her family babysits so they can go on dates," a pal tells Us Weekly of Duff, who gave birth to Luca on March 20, 2012. "They make time for each other."

And although the actress and her former hockey pro husband, 32, love their alone time, they also can't get enough of staying home to bond with their growing bundle of joy. The couple "have sweet nights at home with Luca, cooking dinner and watching movies," adds the pal. "They're closer than ever!"

As Luca approaches his first birthday, Duff and Comrie are already entertaining the idea of another baby, but say they'll inch slowly into second-time parenthood.

"Mike and I are literally so obsessed with Luca. He's perfect! We should just be one and done," Duff told Access Hollywood Live. "But I think once your kid starts getting older you miss that baby phase and you go in for round two."