Associated Press At the MTV Video Music Awards in 2002

Feb. 23, 2000

Aguilera's appearance reflects her music and her audience: young, light, frothy. Simple, straight blond tresses closely frame her face at the Grammy Awards. The style is one of those wash-and-blow-dry looks that a teenager might get for $25 at her local mall salon.

Sept. 7, 2000

Six months later, Aguilera sports a more confident look at the MTV Video Music Awards. Extensions give her hair more length, and the addition of black highlights lends an aggressive edge. Her hair style begins to reveal more of her face, and she begins experimenting with sparkle to brighten up her usual dark eye makeup.

June 2, 2001

Getty Images At the Grammy awards, 2004

Aguilera continues to age herself and move toward a more sexed-up rocker look. She pumps up the volume in her hair, retaining but toning down color highlights. The fake mole moves to the other side of her mouth and strong lip color magnifies her pucker. The result, exemplified at the MTV Movie Awards, is a more radical, intentionally sexy pop priestess.

Sept. 26, 2003

Sporting her latest look, a fusion of goth and punk, Aguilera performs at a concert in Sweden. Long, limp, scraggly black hair and all-black attire project a harder, rebellious image. She continues to favor dramatic jewelry, and the large hoop earrings signal a transition from youth to young adult.

Feb. 8, 2004

Associated Press At the 2006 MTV Movie Awards

Aguilera keeps the locks black but chops them shorter and adds curls and waves. By now, her eyebrows are little more than pencilwork. But with more tastefully applied makeup, it's a softer, cleaner, more mature look that suits the auspiciousness of the Grammy Awards.

June 3, 2006

By now a wife, Aguilera still projects strong sex appeal -- after all, she's only 25. By the time the MTV Movie Awards roll around, she has morphed into a comfortable look that recalls Old Hollywood screen sirens. With wavy blond tresses, more natural brows, less eye makeup, strong red lips and more sophisticated bling, she confidently pays homage to Marilyn Monroe.