Boy, they grow up fast! The youngest member of the Backstreet Boys, Nick Carter, 33, has announced that he is engaged to his girlfriend of four years, Lauren Kitt, 29. The singer announced the big news to People: "I had the ring in my pocket for two weeks," Carter revealed. "I was like, 'I don't want it anymore!' It was driving me insane. I just wanted to get it out of my hands and on to hers." Carter took Kitt out on a romantic boat ride in the Florida Keys to an island that they now refer to as "Engagement Island." He got down on his knee and gave Kitt a seven-carat diamond ring from XIV KARATS. But with the Backstreet Boys' busy schedule, when will the big day happen? Carter admits, "It's not up to us. It's up to the schedule. We're just excited and looking forward to the next chapter of our lives."