Patrick Dempsey boards 'Transformers 3'

"Grey's Anatomy," star Patrick Dempsey has announced he will star in Michael Bay's upcoming sequel "Transformers 3," which Paramount will unleash in theaters July 1, 2011. The film is getting ready to shoot this summer, and of course, Shia LaBeouf and Megan Fox will return as the lead characters.

Variety says Dempsey will play a darker character in the new "Transformers." Dempsey's recent big-screen credits include "Valentine's Day" and "Made of Honor." "T3" will shoot in LA, Chicago, Washington DC, Florida, Texas, Africa, Moscow, and China, and Frances McDormand and John Malkovich also star.