Celebrities on Twitterr!?

Actors

Brea Grant - Plays Daphne, the super speedster, on Heroes.

David Hewlett - Actor best known for his role as Dr. Rodney McKay on Stargate Atlantis.

Janina Gavankar - Played Papi on The L Word. Also appeared in both Barbershop movies.

Kate Hewlett - Sister of David Hewlett. She also played his sister on Stargate Atlantis.

Stephen Fry - Well known British actor, comedian and narrator.

Wil Wheaton - Best known for the role of Wesley Crusher on Star Trek: the Next Generation, Mr. Wheaton has become well known for his passion for all things tech.

William Shatner - This well-known actor has only posted one update as of this writing. Seeing as he has a YouTube() account that is being updated frequently, he may return.

Aschton Kutcher - Well known actor.

Demi Moore - Famous for her 90's roles.

Musicians

Brett Gurewitz - Guitarist for the band Bad Religion, songwriter and record producer. Also owns Epitaph Records.

Britney Spears - With the launch of her new album, Ms. Spears is embracing the Internet with a redesigned website and the launch of a Twitter account. You can read more about this in Searching for the Real Britney in ‘therealbritney’ here on Mashable.

DaveJMatthews - Best known as the lead vocalist, songwriter, and guitarist for the Dave Matthews Band, Dave Matthews is a Grammy award-winning singer-songwriter and musician. He updates fairly regularly.

Jonathan Coulton - Well known on the Internet for self-promotion and writing songs with geek themes.

MC Hammer - Musician, pastor, rising Internet celeb - it seems MC Hammer pops up everywhere.

Patrick Wilson of Weezer - The drummer from the band Weezer posts infrequent updates to his account.

Sara Bareilles - Sara Bareilles is a singer-songwriter and pianist that posts updates from her tour and elsewhere.

P. Diddy - Famous for his music and signed tons of other famous singers.

Politicians

Barack Obama - Senator from Illinois and Democratic presidential candidate.

Chuck Grassley - Republican senator from Iowa.

Hillary Clinton - Senator from New York, former presidential candidate for the Democratic party and the former First Lady.

James DeMint - Republican senator from South Carolina.

James Inhofe - Republican senator from Oklahoma.

Joe Biden - Senator from Delaware and the current Democratic candidate for vice president.

John McCain - Senator from Arizona and the Republican Presidential Candidate.

Tech Celebrities

John C. Dvorak - A columnist writing about technology since the 1980s.

Leo Laporte - Leo Laporte has been a long time commenter on technology issues and host of numerous TV shows and podcasts.

Major Nelson, Xbox Live Director of Programming - Major Nelson is the gamertag of Larry Hryb, the director of programming over at Xbox Live. He gives out codes and other information on his account.

Mike Krahulik of Penny Arcade - One of the authors of the popular webcomic, Penny Arcade.

Robert Scoble - Needing no real introduction, Robert Scoble is one of the best known tech bloggers on the Web.

Scott Kurtz - Creator of the popular Web comic, Player vs Player.

Tony Hsieh, CEO of Zappos - Zappos is everywhere nowadays, even at the bottom of shoe trays at airport security, so it only makes sense they would also pop up on the most popular microblogging service.

Writers

Diablo Cody - Ms. Cody won an Oscar for her film Juno, and has become a popular, though sporadic, poster on Twitter.

James Gunn - Writer, director, actor, musician, James Gunn is a jack-of-all-trades and a prolific Twitter user.

Warren Ellis - Popular comic book writer of series such as Transmetropolitan.

Michael Jackson

I have a few celebrities...

Ashton Kutcher http:// twitter.com/ aplusk

Ryan Seacrest http:// twitter.com/ RyanSeacrest

Joel Madden http:// twitter.com/ JoelMadden

Ashlee Simpson http:// twitter.com/ ashsimpsonwentz

Gabe Saporta http:// twitter.com/ GabrielSaporta

Pete Wentz http:// twitter.com/ petewentz

William Beckett http:// twitter.com/ billbeckett

John Mayer http:// twitter.com/ johncmayer

Perez Hilton http:// twitter.com/ perezhilton

Taylor Swift http:// twitter.com/ taylorswift13

Demi Lovato http:// twitter.com/ ddlovato

Miley Cyrus http:// twitter.com/ mileycyrus

Selena Gomez http:// twitter.com/ selenagomez

I do know that Demi Moore and Ashton Kutcher are on Twitter but don't know their username sorry..maybe they use they own name instead of a nickname.

practically every celebrity has a twitter. the only ones i know for sure that don't have one are zac efron and vanessa hudgens because they publicly announced that they don't have one. just type "CELEB NAME HERE twitter" on google and if they have one it will be the first link (:

I know that Demi Lovato has a Twitter.

http://www.twitter.com/ddlovato

yea i know the jonas brother just got one.... the real one ...