A mystery hunk is gay. And he's going to announce it to the world on 90210. Also today: David O. Russell storms off another set, Sela Ward is given a gun and a badge, and Dustin Hoffman's new TV career.

Adrian Grenier turns 33 today. Jessica Simpson is turning 29. City comptroller (and mayoral wannabe) William Thompson is turning 56. Former mayor David Dinkins is turning 82. Times film critic A.O. Scott is 43. Showtime chief Matt Blank is turning 59. Author and marketing guru Seth Godin is 49. Writer Alice Munro is…