Celebrities are reacting to the tragic news of actor Robin Williams' death.

The 63-year-old actor was found dead in his home this afternoon, and his death is being investigated as a possible suicide.


PICS: Last Public Photo of Robin Williams, Final Instagram Post

Celebrities React to Robin Williams' Death

FLASHBACK: Robin Williams Performs Stand-Up for US Troops Overseas

Larry King: Williams ‘Gave the Gift of Laughter, a Gift We Can Never Repay


Read some of the celebrity tweets below.

Williams' on-screen daughters from "Mrs. Doubtfire" also took to Twitter shortly after hearing of his passing:

Fox News hosts and contributors sounded off on the sad news, too:


PICS: Last Public Photo of Robin Williams, Final Instagram Post

Celebrities React to Robin Williams' Death

FLASHBACK: Robin Williams Performs Stand-Up for US Troops Overseas

Larry King: Williams ‘Gave the Gift of Laughter, a Gift We Can Never Repay