RD / Dziekan / Retna Digital 1 / 3
RD / Dziekan / Retna Digital 1 / 3

Nick Jonas is a high school graduate.

"I'm happy to announce I have graduated! Class of '09!" the 16-year-old Jonas Bro -- who is home schooled -- wrote on Twitter.

See what the Jonas Bros looked like as babies.

"Congrats to everyone else who has also graduated this year," he said, signing off "Mr. President (Nick).

(He earned the "Mr. President" nickname for bossing around Kevin, 21, and Joe, 19.)

Check out photos from the Jonas Bros' 3-D Concert Experience movie.

Jonas recently "reconnected" with his ex, Miley Cyrus.

"We don't know what's going to happen in the future, but right now we're just kind of kicking it and hanging out as much as we can," said Cyrus -- who split from beau Justin Gaston earlier this month.

See cute pics of Nick Jonas' dog.

The Jonas Bros are currently on a world tour. Their fourth album, Lines, Vines and Trying Times, hit stores today.