Last week, we heard MICHAEL JACKSON'S oldest son, 16-year-old PRINCE MICHAEL, had lined up a gig as a "special correspondent" for "Entertainment Tonight".  Now, he's landed a guest spot on "90210".

Prince Michael will make his acting debut on the show's season finale, which airs sometime in May.  He's playing a character named Cooper . . . "a trauma victim, who bonds with Jessica Stroup's character, Erin Silver."