ENGAGED: “Dawson’s Creek” costars James Van Der Beek, 25, and Kerr Smith, 29, are getting married. No, not to each other. Van Der Beek, who plays moody Dawson Leery on the show, and “Party of Five” actress Heather McComb, also 25, have announced their engagement, says the New York Post, quoting his publicist. No date has been mentioned. Smith, who plays the openly gay Jack McPhee, also popped the question to Ali Hillis, of MTV’s “Undressed,” says the paper . . . RULED: Judge Bernard J. Kamins praised Paula Poundstone’s progress Wednesday, easing the entertainer’s probation terms in a child-endangerment case and allowing Poundstone, 42, to have non-monitored work days, reports the Associated Press. However, she will still be monitored when she has daytime visits with her three adopted children. Poundstone lost custody of her foster children . . . FOCUSED: The latest subject for an Oliver Stone film will be Cuban leader Fidel Castro, USA Today reports. Stone, 55, who has produced controversial features on the assassination of John F. Kennedy (the 1991 “JFK”) and the administration of Richard Nixon (1995’s “Nixon”), is in Havana working on the film, which will be a documentary . . . PACKED: The artist known again as Prince, 44, will kick off a two-month tour on March 1 in Saginaw, Mich., and wrap it up on May 4 in Las Vegas, according to VH-1. The Purple One is offering the first tickets to members of his New Power Generation Music Club . . .