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So many changes, so little time.

This past week, multiple stars stepped out with new hairstyles, including Hayden Panettiere making her return to social media by debuting a dramatic haircut and Selena Gomez sporting a new cut and color while promoting her new album. Plus, Kaia Gerber is rocking a chic new look that even her model pals are gushing over. Hm...anyone else feeling inspired to hit their hair salon before Christmas? 

But some major blockbusters also underwent some transformations, with Wonder Woman debuting an epic new look in the first trailer for the highly anticipated sequel and Ghostbusters introducing us to a whole new cast of characters with ties to the iconic '80s film. New era, new look, new ghosts! 

And in a new interview, Rebel Wilson revealed her unexpected weight loss while filming Cats, in which she co-stars with another major star undergoing a transformation this week: Taylor Swift

Check out this week's biggest celebrity and pop culture transformations: 

Hayden Panettiere

Getty Images/Twitter

Kaia Gerber, Hair

Instagram

Selena Gomez, London Outfits

Shutterstock

Taylor Swift, TBT Instagram

Instagram/Taylor Swift

Wonder Woman 1984 Trailer, Screengrab

YouTube/Warner Bros.

Ghostbusters 3 - Paul Rudd

Maker Studios

Rebel Wilson, Cats

Universal Pictures

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