Dove Cameron is slowing transforming into Amber Von Tussle!

The 20-year-old actress has been busy at work on Hairspray Live rehearsals, and even gave fans a sneak peek at her wardrobe fitting.

PHOTOS: Check out the latest pics of Dove Cameron

“wardrobe fittings|little miss von tussle @nbchairspraylive,” Dove captioned an Instagram pic of herself rocking a gorgeous green dress.

The musical takes place in Baltimore in the early ’60s, when teenager Tracy Turnblad lands her dream role on the popular Corny Collins Show and becomes a dancing sensation overnight, crossing paths with a colorful array of characters along the way.

It premieres on December 7 @ 8 p.m. on NBC!

In case you missed it, watch the Hairspray Live cast’s killer performance at the Macy’s Thanksgiving Day Parade!

Photos: Instagram

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