Christina Aguilera is really working it!

The 35-year-old singer is flaunting her impressive weight loss in a new Instagram post, showing off her lean curves in a sexy Santa outfit.

christina aguilera weight loss getty/instagram
Getty Images, Instagram

The mother-of-two's weight has definitely fluctuated through the years — but it's clear, she's now looking healthier than ever.

MORE: Kylie Jenner Dresses up as Christina Aguilera for the Singer's Birthday

Click through the gallery below to see Christina Aguilera's amazing transformation through the years!