MOVIES
+ Sigourney Weaver will join Tina Fey and Amy Poehler in Michael McCullers' comedy Baby Mama. Weaver will star as ''the head of a very-much-for-profit fertility clinic,'' says Fey, whose character is a client with a ticking biological clock. Poehler plays Fey's trashy surrogate, who, says producer John Goldwyn, ''breaks up with her boyfriend and moves in with Tina.''

+ Director David Goyer and scribe Sheldon Turner will explore X-Menvillain Magneto's tragic side as a Holocaust survivor in a spin-off (the second, following Hugh Jackman's upcoming Wolverine). ''In the first three X-Men movies, Professor X and Magneto are enemies,'' says an insider. ''The backstory is they were best friends.'' Plus: Expect an Ian McKellen cameo.

+ Isla Fisher will star as The Cookie Queen, whose all-time Girl Scout cookie sales record is threatened by a fifth grader. Says Jeremy Haft, who penned the script with Ed Gonzalez: ''It's always fun to see adults take on a little kid.'' One box of Thin Mints, please.


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