Frankie Avalon will guest star on the Feb. 23 episode of Sabrina, the Teenage Witch... Valerie Harper and Howard Hesseman will play the divorced parents of Steven (series regular David Alan Basche) on the Feb. 6 episode of NBC's new comedy Three Sisters... Italian filmmaker Dino De Laurentiis (who produced the upcoming Hannibal) will receive the Irving G. Thalberg Memorial Award at this year's Oscar ceremony on March 25. — Michael Ausiello