To give the cast a sense of what to expect, Marshall invited the actors to London's Shepperton Studios to watch a rehearsal of a new musical number, "Trip a Little Light Fantastic." According to Streep, "It was unbelievable. Unbelievable! I don't know anybody else on Earth that could have done that except Rob Marshall. And that's when I said, 'OK. This is a gift to the world.'" It was then that Streep knew she was part of an "amazing" project. "You can kind of tell, you know? Everybody's walking around with their cheeks a little pinker, and you just know that everybody [has] got a secret. They've got something really good under wraps until Christmas."

Streep, who worked with costume designer Sandy Powell to create Topsy's over-the-top look, was just as in awe when it was time to start shooting. "The first day I walked in, I was 67 years old and Rob pointed to the chandelier and said, 'Now, you up these steps, then jump off, then you'll twirl around on that,'" she says. Jokingly, Streep adds, "I almost got out my return ticket."

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