My Favorite Scene: Mizuo Peck

Mizuo Peck possessed few acting credits — only guest appearances on Law & Order: Criminal Intent, All My Children, and Witchblade, for example — before landing her big-screen debut in the new Ben Stiller hit. ''My favorite [part] is at the end, where everybody's having a good time and causing havoc,'' says the part-Cherokee New York-born actress, 29, who plays a wax replica of the 19th-century Native American guide Sacagawea, which comes to life nightly inside the city's Museum of Natural History. ''I'm on the back of a horse with Robin Williams, and I remember the director [Shawn Levy] kept saying to me, 'You don't have to smile that big!' But I couldn't believe I was there and hugging Robin Williams. I just had this giant Kool-Aid smile the whole time!''