After almost four years of dating, Nick Lachey and Vanessa Minnillo are engaged, their reps confirm exclusively to

"We're excited and incredibly happy about our engagement and we look forward to a wonderful future together," the couple said in a statement.

"They're so happy, doing great. Thrilled about it," a source close to the couple also tells UsMagazine.

The couple began dating in 2006, not too long after Lachey's very public divorce from his first wife, singer Jessica Simpson. The pair broke up briefly last year but reconciled soon after.

In an interview with Parade earlier this year, Minnillo talked about what it takes to have a strong relationship in Hollywood. "You have to talk through everything. It's all about communication. We talk daily about things that upset us. It's about having a sounding board because if you hold in all your thoughts, dreams, anger and anxiety than you're only hurting yourself, " she said.