The unofficial king of Twitter, Greg Grunberg (who also fell for the Jeff Goldblum death hoax last night, gullible lug!), was straightforward about the matter:
"Terrible news about Farrah Fawcett and Michael Jackson AND Ed McMahon... they will be missed by all."

Rainn Wilson classily managed to make it all about himself, but still, an appropriate tribute:
"I stumbled upon this video on some stupid VH-1 show yesterday and was awestruck by it's awesomeness. R.I.P. M.J. http://tinyurl.com/yr8b77"

Rob Corddry, being awesome:
"I wish it had been Michael Jackson that broke the story of TMZ dying. I can almost hear the high-fives."

Because he has no genuine emotions beyond "Want! Faaaaaame!", Spencer Pratt had to re-tweet MTV's reaction:
"RT @MTV: King of Pop's Death is confirmed by CNN @MTVBuzzworthy with your thoughts and memories of this music legend ! This is so sad!"

If you care what Miley Cyrus claims her inspiration is, like that girl has ever been inspired by anything, ever:
"Michael Jackson was my inspiration. love and blessings"

Yeah, like Kim Kardashian really prays:
"Wow I am truly in shock that Michael Jackson has passed away! I love u Jackson family, my prayers are with the whole family!"

For once, I don't really have anything mean to say about something Denise Richards said:
"this is just so sad !! I can't believe it! Shocking .."

Don't boss me, Danny Gokey, even if it is for a noble cause:
"Please pray for Micheal Jackson!!!!"

Kirstie Alley saw it through the eyes of a celebrity who has been beaten to hell by the press, which made me particularly sad for some reason:
"Don't know what to say...so I will say I am so sorry for his family either way... What a horrible way to find these things out...sorry"

I know he's not really a TV star either, but shut the fuck up, Dane Cook:
"I'm dedicating my show 2night to Michael Jackson. THRILLER got me laid. Well... At least thats what I told my friends."

And to Michael Ian Black for the gallows humor, as always:
"First morning without Michael Jackson. The world has lost a superstar but gained a ton of hair relaxer."

Of course there are many, many more. Michael Jackson was the most famous person ever! Leave your reactions in the comments.