He'll be a regular on show about earthbound spirits. Funnyman JAMIE KENNEDY will be shifting gears to appear as a regular in the CBS drama "Ghost Whisperer," according to the Hollywood Reporter . Kennedy, who has appeared in various comedies and produced and starred in his prank show "The Jamie Kennedy Experiment," will play a graduate student in psychology who forms a bond with JENNIFER LOVE HEWITT 's character Melinda. Kennedy will come on board just before the departure of JAY MOHR , who has played a professor on "Ghost Whisperer" the past two seasons, but is expected to move full-time to his new CBS comedy series "Project Gary." ...