The Jonas Brothers are still on the market -- and they don't mind a bit.

"Singling it up and enjoying it!" Kevin, 20, told last night at the Chevy Rocks the Future concert in Burbank, California, when asked if they were seeing anyone.

They're also flying solo on stage. They recently kicked off their "When You Look Me in the Eyes" tour, after being on the road with celeb darling Miley Cyrus, to whom brother Nick, 15, was linked. "I's just us," Kevin says of touring. "We left the Hannah Montana tour. We did the movie, and the movie is doing fantastic. Totally excited."

They're also psyched for their new single, "When You Look Me in the Eyes."

Says brother Nick, "We're crossing our fingers for a No. 1 this time... you never know!"

How are the brothers adjusting to their fast fame?

"It's a crazy feeling when there are thousands of girls waiting in the other room," says Joe, 18, adding, "It's weird, but it's exciting for us."