NCIS babe Sasha Alexander, whose murdered alter ego will be "resurrected" in the Sept. 20 season premiere, has joined the cast of Mission: Impossible 3, per Variety.... Hilary Duff's greatest-hits disc, Most Wanted, bowed at No. 1 on Billboard with sales of 208,000 copies.... Comedy Central has pulled the Sunday-night editions of Weekends at the D.L. as execs rethink the show's overall format. Several writers have also been let go.... VH1 has picked up the aborted NBC series I'm a Celebrity But I Wanna Be a Pop Star, although a premiere date has not been set.