Actor Patrick Dempsey has poked fun at false rumours suggesting he had died in a car accident by posting a funny message on Twitter.com on Thursday (29Mar12).

RIPPatrick Dempsey quickly became a trending topic on the social networking site

The Grey's Anatomy hunk, an avid car racer, became the latest celebrityto be killed off in a sick online hoax this week (begs26Mar12), and "RIP - Patrick Dempsey" quickly became a trending topic on the social networking site.

But the actor, whose last tweet was sent out last week (22Mar12), has since brushed off the cruel joke by writing, "Hi I am back From the dead!"

Dempsey joins a long list of stars targeted by pranksters - country veteran Reba McEntire, superstar Cher and singer Jon Bon Jovi have all been 'killed off' in recent weeks.