Reese WitherSpoon has joined the cast of Night at the Museum 2: Escape From the Smithsonian, according to

The sequel to the Night at the Museum box office hit will bring the dead presidents and extinct animals of the "Smithsonian" back to life.

The original film featured single father Larry Daley (Ben Stiller), as he grudgingly accepts the supposedly menial graveyard shift as a security guard at the Natural History Museum. To his utter astonishment and disbelief, Larry watches in shock and awe as, one by one, the primeval beasts and storied icons that surround him stir magically to life - and total havoc ensues.