With her recent divorce filing and her first major film, "Burlesque," about to hit theaters Nov. 24, Christina Aguilera is experiencing a lot of ups and downs.

The same could be said for the 29-year-old pop star's style.

From midriff-baring teen queen to X-rated Xtina to Old Hollywood-inspired glamour-puss, the mother of one has undergone more head-to-toe transformations than most.

Look back at some of her most memorable outfits and hairstyles in the above gallery.

Toto, I don't think we're in the "Mickey Mouse Club" anymore...

Meanwhile, check out Hilary Swank's style evolution.