Movies Watch Taylor Swift, Idris Elba, James Corden in new behind-the-scenes preview of Cats By Rosy Cordero Rosy Cordero Rosy covers the news for Entertainment Weekly in Los Angeles. Nice to meet you! EW's editorial guidelines Published on September 10, 2019 02:53PM EDT It only makes sense that self-confessed cat-obsessed music superstar Taylor Swift is playing one in the upcoming big-screen adaptation of the hit musical Cats. But even she can’t believe it’s happening. “If you told me I was going to get to be a cat for work…WHAT?” Swift, who plays a feline named Bombalurina, exclaims in a new preview of the Dec. 20 release. Idris Elba and James Corden are also featured in the behind-the-scenes clip, above, which offers a look into the “cat school” where the cast learned choreography (catreography?) and rehearsed ahead of the movie’s filming late last year into this spring. Corden, who brings to life Bustopher Jones, adds, “You’re going to take a load of people and they’re going to pretend to be cats. If you just say it out loud, it sounds bonkers. But that’s where the most fun happens, really.” Elba admits the movie forced him out of his comfort zone. “I’m observing all the cats, and I’m singing and I’m dancing with the best dancers in the world,” says Elba. “So, I’m a little intimidated.” Cats, directed by Tom Hooper (Les Misérables, The King’s Speech) also stars Judi Dench, Ian McKellen, Jennifer Hudson, Francesca Hayward, Jonadette Carpio, Robbie Fairchild, and Jason Derulo. Related content: Watch the first Cats trailer with Jennifer Hudson, Taylor Swift, and more Cats first look: Behind the scenes of the musical with Taylor Swift, Jennifer Hudson Cats brings behind-the-scenes footage for CinemaCon first look Taylor Swift, Jennifer Hudson, Ian McKellen join Cats film adaptation