Let's make this birthday one to remember.

49 years old (Born on December 18, 1975)

Happy Birthday, Sia! May your celebrations swing from the chandelier and be as unstoppable as your iconic wigs. You've given us countless hits that we can't help but belt out (badly) in our cars—thank you for making traffic jams bearable!

From "Cheap Thrills" to "Elastic Heart," you've shown us how music can touch hearts while keeping faces hidden behind fabulous hairdos. Your powerful voice and unique style continue inspiring millions worldwide.

Here's hoping this year brings even more chart-topping anthems, unforgettable performances, and perhaps a wig collection big enough to rival Dolly Parton's wardrobe. Cheers to another amazing trip around the sun!