Nick Carter is engaged.

The Backstreet Boys singer proposed to his girlfriend of four years Lauren Kitt, in the Florida Keys with a seven-carat diamond ring from XIV KARATS on Wednesday and admitted he was desperate to pop the question.

Nick, 33, told People, "I was like, 'I don't want [the ring] anymore!' It was driving me insane. I just wanted to get it out of my hands and on to hers. She said, 'Yes,' and I'm, like, 'I don't know what to do. She said, 'You're supposed to put it on my finger.' So I did. I was in shock."

Fitness expert/actress Lauren, 29, admitted she was shocked by the proposal and acknowledged wedding dates will have to be worked around the upcoming Backstreet Boys tour: "I wasn't expecting it. It just felt very surreal. We both are just so happy in love right now and on cloud nine. Our first thought was, 'We need to contact the Backstreet Boys and find out when their schedule will permit.' 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."